Podcast
Questions and Answers
Which muscles are primarily responsible for the movement of the thenar eminence?
Which muscles are primarily responsible for the movement of the thenar eminence?
- Adductor pollicis, Palmaris longus, Flexor digiti minimi
- Palmar interossei, Abductor pollicis longus, Opponens digiti minimi
- Abductor pollicis brevis, Flexor pollicis brevis, Opponens pollicis (correct)
- Extensor pollicis brevis, Flexor pollicis longus, Opponens pollicis
What is a primary role of the rotator cuff muscles?
What is a primary role of the rotator cuff muscles?
- To extend the elbow during physical activity
- To stabilize the shoulder and permit a range of motions (correct)
- To assist in wrist extension
- To flex and rotate the spine
Which muscle is specifically known for inserting into the ulnar tuberosity?
Which muscle is specifically known for inserting into the ulnar tuberosity?
- Coracobrachialis
- Brachialis (correct)
- Biceps brachii
- Flexor carpi ulnaris
Which muscle is responsible for flexing the thumb across multiple joints?
Which muscle is responsible for flexing the thumb across multiple joints?
What is the primary function of the brachioradialis muscle?
What is the primary function of the brachioradialis muscle?
At which joints does the extensor expansion facilitate finger extension?
At which joints does the extensor expansion facilitate finger extension?
Which action is performed by the supraspinatus muscle?
Which action is performed by the supraspinatus muscle?
What is the function of the palmar interossei muscles?
What is the function of the palmar interossei muscles?
Flashcards
What muscles make up the thenar eminence?
What muscles make up the thenar eminence?
The thenar eminence is a prominent fleshy mound on the radial side of the palm, composed of muscles responsible for thumb movement. These muscles are the abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis.
What is the function of the rotator cuff muscles?
What is the function of the rotator cuff muscles?
The rotator cuff muscles, including supraspinatus, infraspinatus, teres minor, and subscapularis, are crucial for providing dynamic stability to the shoulder joint. They help control the movements of the humerus within the glenoid cavity.
Which muscle inserts into the ulnar tuberosity and coronoid process?
Which muscle inserts into the ulnar tuberosity and coronoid process?
The brachialis is a large muscle located on the anterior aspect of the upper arm. It plays a significant role in flexing the elbow joint, especially when the hand is in a neutral position.
Which muscle flexes the thumb at the CMC, MCP, and IP joints?
Which muscle flexes the thumb at the CMC, MCP, and IP joints?
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The _______ muscle is located on the lateral forearm and primarily flexes the elbow, especially in a neutral hand position.
The _______ muscle is located on the lateral forearm and primarily flexes the elbow, especially in a neutral hand position.
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The extensor expansion, also known as the dorsal hood, serves to extend the fingers at the _______ and _______ joints.
The extensor expansion, also known as the dorsal hood, serves to extend the fingers at the _______ and _______ joints.
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True/False: The palmar interossei muscles adduct the fingers toward the midline of the hand.
True/False: The palmar interossei muscles adduct the fingers toward the midline of the hand.
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True/False: The glenohumeral joint is stabilized by the coracoclavicular ligament.
True/False: The glenohumeral joint is stabilized by the coracoclavicular ligament.
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Study Notes
Hand Muscles
- Thenar eminence muscles: Abductor pollicis brevis, Flexor pollicis brevis, Opponens pollicis
- Flexor pollicis longus flexes the thumb at the CMC, MCP, and IP joints.
Shoulder Complex Muscles
- Rotator cuff function: Provides dynamic stability to the glenohumeral joint.
- Supraspinatus abducts the arm at the shoulder.
- Teres major medially rotates and adducts the arm.
Forearm Muscles
- Brachialis: Inserts into the ulnar tuberosity and coronoid process, flexing the elbow.
- Brachioradialis: Located on the lateral forearm, primarily flexes the elbow in a neutral hand position.
- Extensor carpi radialis longus: Extends and abducts the wrist.
- Palmar interossei: Adduct the fingers toward the hand's midline.
Joint Stabilizers and Actions
- Glenohumeral joint stabilization: Primarily supported by the rotator cuff muscles, NOT the coracoclavicular ligament. The coracoclavicular ligament stabilizes the acromioclavicular joint.
- Extensor expansion (dorsal hood): Extends the fingers at the PIP and DIP joints.
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Description
This quiz explores the essential muscles of the hand, shoulder complex, and forearm, detailing their actions and functions. You'll test your knowledge on muscle groups such as the thenar eminence, rotator cuff, and elbow flexors. Understanding these muscle functions is crucial for grasping human anatomy and biomechanics.
