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Questions and Answers
What joint is formed by the articulation of the clavicle and the sternum?
What joint is formed by the articulation of the clavicle and the sternum?
Which of the following bones is NOT part of the wrist joint?
Which of the following bones is NOT part of the wrist joint?
What anatomical feature is associated with a 'dinner fork deformity'?
What anatomical feature is associated with a 'dinner fork deformity'?
What enables pronation and supination of the forearm?
What enables pronation and supination of the forearm?
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Which of the following accurately describes the wrist joint?
Which of the following accurately describes the wrist joint?
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Which joint connects the humerus to the scapula?
Which joint connects the humerus to the scapula?
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What anatomical structure is located at the distal end of the ulna?
What anatomical structure is located at the distal end of the ulna?
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Which pair of bones articulates to form the elbow joint?
Which pair of bones articulates to form the elbow joint?
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What bone does the radius transmit force to, via the interosseus membrane?
What bone does the radius transmit force to, via the interosseus membrane?
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Which of the following statements about the wrist is correct?
Which of the following statements about the wrist is correct?
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How is the thumb unique among the phalanges?
How is the thumb unique among the phalanges?
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Which joint connects the arm to the trunk?
Which joint connects the arm to the trunk?
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What is the correct term for the bones that make up the fingers?
What is the correct term for the bones that make up the fingers?
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Which of the following bones is NOT part of the upper limb?
Which of the following bones is NOT part of the upper limb?
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Which component is primarily responsible for force transmission from the hand to the radius?
Which component is primarily responsible for force transmission from the hand to the radius?
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What structure primarily makes up the hand?
What structure primarily makes up the hand?
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What is the primary function of the anterior and posterior radioulnar ligaments?
What is the primary function of the anterior and posterior radioulnar ligaments?
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What role does the interosseous membrane play in the forearm?
What role does the interosseous membrane play in the forearm?
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During which movements do the anterior and posterior radioulnar ligaments provide support?
During which movements do the anterior and posterior radioulnar ligaments provide support?
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How is force transmitted through the forearm?
How is force transmitted through the forearm?
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What structure primarily allows the radius and ulna to work as a single unit?
What structure primarily allows the radius and ulna to work as a single unit?
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Which component is essential for maintaining stability during forearm movements?
Which component is essential for maintaining stability during forearm movements?
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What is the main consequence of damage to the interosseous membrane?
What is the main consequence of damage to the interosseous membrane?
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Which of the following structures is NOT directly involved in the connection between the radius and ulna?
Which of the following structures is NOT directly involved in the connection between the radius and ulna?
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How many carpal bones are there in the human wrist?
How many carpal bones are there in the human wrist?
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Which carpal bone is most commonly fractured?
Which carpal bone is most commonly fractured?
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What structure passes through the carpal tunnel?
What structure passes through the carpal tunnel?
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Which of the following bones is NOT a carpal bone?
Which of the following bones is NOT a carpal bone?
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What is the function of the articular disc in the wrist?
What is the function of the articular disc in the wrist?
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Which two carpal bones are located on the proximal row of carpal bones?
Which two carpal bones are located on the proximal row of carpal bones?
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Which metacarpal corresponds to the thumb?
Which metacarpal corresponds to the thumb?
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Which bone does not have a middle phalanx?
Which bone does not have a middle phalanx?
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What action does supination of the forearm involve?
What action does supination of the forearm involve?
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Which muscle has its origin at the ulna and interosseous membrane and is responsible for extending the thumb?
Which muscle has its origin at the ulna and interosseous membrane and is responsible for extending the thumb?
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Where does the extensor pollicis brevis insert?
Where does the extensor pollicis brevis insert?
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Which muscle assists in the abduction of both the thumb and the hand at the wrist?
Which muscle assists in the abduction of both the thumb and the hand at the wrist?
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What landmark does the extensor pollicis longus and extensor pollicis brevis border?
What landmark does the extensor pollicis longus and extensor pollicis brevis border?
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Which muscle extends the second digit independently?
Which muscle extends the second digit independently?
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The posterior interosseous nerve innervates which muscle groups?
The posterior interosseous nerve innervates which muscle groups?
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What is the primary role of the abductor pollicis longus muscle?
What is the primary role of the abductor pollicis longus muscle?
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What is the primary function of the muscles located in the forearm?
What is the primary function of the muscles located in the forearm?
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Which of the following regions specifically includes the elbow joint?
Which of the following regions specifically includes the elbow joint?
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Which joints primarily allow for the basic movements at the wrist?
Which joints primarily allow for the basic movements at the wrist?
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What is a significant functional implication of injuries to the wrist?
What is a significant functional implication of injuries to the wrist?
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Which compartment of the arm is important for understanding the muscles involved in wrist movements?
Which compartment of the arm is important for understanding the muscles involved in wrist movements?
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Which of the following statements correctly describes a role of the interosseous membrane?
Which of the following statements correctly describes a role of the interosseous membrane?
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How many bones are in the wrist region, including carpal bones?
How many bones are in the wrist region, including carpal bones?
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What anatomical region comprises the area surrounding the acromion?
What anatomical region comprises the area surrounding the acromion?
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Which muscle originates from the lateral epicondyle and helps in the extension of the hand?
Which muscle originates from the lateral epicondyle and helps in the extension of the hand?
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What is the primary role of the extensor carpi ulnaris?
What is the primary role of the extensor carpi ulnaris?
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Which of the following muscles contribute to the extension at all proximal joints of digits 2–5?
Which of the following muscles contribute to the extension at all proximal joints of digits 2–5?
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Which nerve innervates the extensor carpi muscles?
Which nerve innervates the extensor carpi muscles?
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Which extensor muscle assists in the abduction of the hand at the wrist?
Which extensor muscle assists in the abduction of the hand at the wrist?
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What is the insertion point of the extensor carpi radialis brevis?
What is the insertion point of the extensor carpi radialis brevis?
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Which muscle is responsible for extending the wrist but does not assist in finger extension?
Which muscle is responsible for extending the wrist but does not assist in finger extension?
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What action do the extensor carpi radialis and the flexor carpi radialis have in common?
What action do the extensor carpi radialis and the flexor carpi radialis have in common?
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What action does the abductor pollicis longus perform?
What action does the abductor pollicis longus perform?
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Which muscle independently extends the second digit?
Which muscle independently extends the second digit?
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Where does the extensor pollicis longus originate?
Where does the extensor pollicis longus originate?
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Which landmark is bordered by the extensor pollicis longus and extensor pollicis brevis?
Which landmark is bordered by the extensor pollicis longus and extensor pollicis brevis?
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What is the primary innervation of the extensor indices muscle?
What is the primary innervation of the extensor indices muscle?
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Which muscle assists with extension of the hand at the wrist in addition to extending the thumb?
Which muscle assists with extension of the hand at the wrist in addition to extending the thumb?
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What is the insertion point of the extensor pollicis brevis?
What is the insertion point of the extensor pollicis brevis?
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Which structure serves as a landmark for the radial artery and the superficial branch of the radial nerve?
Which structure serves as a landmark for the radial artery and the superficial branch of the radial nerve?
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Which muscle does not cross the wrist and contributes to extension at the elbow?
Which muscle does not cross the wrist and contributes to extension at the elbow?
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What is the origin of the extensor carpi ulnaris muscle?
What is the origin of the extensor carpi ulnaris muscle?
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Which muscle assists in both flexion and abduction of the wrist?
Which muscle assists in both flexion and abduction of the wrist?
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Which nerve innervates the muscles originating from the lateral epicondyle?
Which nerve innervates the muscles originating from the lateral epicondyle?
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Which of the following muscles originates from both the radius and ulna?
Which of the following muscles originates from both the radius and ulna?
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Which muscle provides adduction at the wrist?
Which muscle provides adduction at the wrist?
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Which of the following muscles is primarily responsible for flexion at the elbow?
Which of the following muscles is primarily responsible for flexion at the elbow?
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Which of the following nerves innervates the posterior compartment muscles?
Which of the following nerves innervates the posterior compartment muscles?
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What main action is performed by the pronator teres muscle?
What main action is performed by the pronator teres muscle?
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Which branch of the radial nerve is responsible for cutaneous innervation to the dorsum of the hand?
Which branch of the radial nerve is responsible for cutaneous innervation to the dorsum of the hand?
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What does paralysis of the posterior interosseous nerve primarily affect?
What does paralysis of the posterior interosseous nerve primarily affect?
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Which anatomical structure is associated with wrist drop?
Which anatomical structure is associated with wrist drop?
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Which muscles are primarily innervated by the deep branch of the radial nerve?
Which muscles are primarily innervated by the deep branch of the radial nerve?
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Where is a common location to palpate the radial artery pulse?
Where is a common location to palpate the radial artery pulse?
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How would you differentiate between paralysis of the radial nerve and posterior interosseous nerve?
How would you differentiate between paralysis of the radial nerve and posterior interosseous nerve?
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What is the primary function of the muscles located in the posterior compartment of the forearm?
What is the primary function of the muscles located in the posterior compartment of the forearm?
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Study Notes
Bones of the Upper Limb
- The upper limb is composed of the humerus, radius, ulna, clavicle, scapula and carpal bones.
- The carpal bones form the wrist joint, which separates the forearm from the hand.
- The shoulder joint connects the humerus to the scapula.
- The elbow joint connects the humerus to the radius and ulna.
Distal Radius Fracture
- A distal radius fracture is a common injury, often referred to as a "dinner fork deformity."
- The styloid process of the radius is also commonly fractured.
Radioulnar Joints
- The proximal and distal radioulnar joints are responsible for the pronation and supination of the forearm.
- The annular ligament surrounds the head of the radius, holding it in place during movement.
- The interosseous membrane helps to hold the radius and ulna together, allowing them to act as a single unit.
Interosseous Membrane
- The interosseous membrane facilitates the transmission of force from the hand to the humerus.
- It acts as a bridge between the radius and ulna, distributing force effectively across the forearm bones.
Wrist and Hand Bones
- The carpal bones include the scaphoid, lunate, triquetrum, pisiform, hamate, capitate, trapezoid and trapezium.
- The scaphoid and lunate are commonly fractured.
- The carpal bones articulate at intercarpal joints.
Deep Posterior Muscles
- The extensor pollicis longus and extensor pollicis brevis extend the thumb and assist with hand extension at the wrist.
- The abductor pollicis longus abducts the thumb and assists in hand abduction at the wrist.
- The extensor indices muscle independently extends the second digit and assists with hand extension at the wrist.
Posterior Neurovasculature
- The radial nerve is a key nerve in the posterior compartment, supplying motor function to the extensor muscles and sensory function to the dorsum of the hand.
- The anatomical snuffbox is a landmark that indicates the location of the radial artery and superficial branch of the radial nerve.
Learning Outcomes
- Identify and describe the bones and joints related to the wrist and hand
- Explain the basic movements that occur at the wrist
- Identify the muscles of the forearm
- Describe the innervation and functions of the muscles of the forearm
- Predict functional implications of musculoskeletal injuries to the forearm and wrist regions
Regions of the Upper Limb
- The upper limb consists of several anatomical regions, including the shoulder, arm, elbow, forearm, and hand.
Superficial Posterior Muscles
- The extensor carpi ulnaris, extensor carpi radialis longus and brevis, and extensor digitorum muscles reside in the superficial posterior compartment of the forearm.
- These muscles all contribute to extending the hand at the wrist.
- Extensor carpi radialis longus and brevis further assist with abduction of the hand at the wrist.
- Extensor carpi ulnaris contributes to adduction of the hand at the wrist.
- Extensor digitorum attaches to the extensor expansions of digits 2-5, contributing to extension at all proximal joints.
Deep Posterior Muscles
- The extensor pollicis longus and brevis extend the thumb and assist with extending the hand at the wrist.
- Abductor pollicis longus abducts the thumb and assists with abducting the hand at the wrist.
- Extensor indices extends the 2nd digit independently and assists with extending the hand at the wrist.
- The extensor pollicis longus and brevis border the 'anatomical snuff box,' which is a landmark for the radial artery and superficial branch of the radial nerve.
Posterior Neurovasculature
- The posterior compartment of the forearm is entirely innervated by the radial nerve and its branches, the deep branch of the radial nerve and the posterior interosseous nerve.
- The radial nerve is responsible for the innervation of the extensor muscles of the forearm, contributing to wrist extension
- The posterior interosseous nerve innervates the deep posterior compartment of the forearm, enabling fine motor movements of the hand.
Lecture 3 Simplified Muscle Chart
- The pronator teres muscle is a primary pronator of the forearm, contributing to the rotation of the forearm.
- The pronator teres muscle is innervated by the median nerve.
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Description
This quiz covers the anatomy of the upper limb, focusing on the humerus, radius, ulna, clavicle, and joints. It also discusses common injuries like distal radius fractures, including the mechanics of the radioulnar joints and the significance of the interosseous membrane. Test your knowledge on these essential topics in upper limb anatomy.