Podcast
Questions and Answers
What primary action does the long head of the triceps perform at the shoulder joint?
What primary action does the long head of the triceps perform at the shoulder joint?
- Rotate the arm medially
- Flex the arm
- Extend and adduct the arm (correct)
- Abduct the arm
Which nerve is NOT a primary supplier to the muscles in the back of the arm and forearm?
Which nerve is NOT a primary supplier to the muscles in the back of the arm and forearm?
- Median nerve (correct)
- Musculocutaneous nerve (correct)
- Radial nerve
- Ulnar nerve (correct)
What is the anatomical landmark where the axillary artery becomes the brachial artery?
What is the anatomical landmark where the axillary artery becomes the brachial artery?
- Midpoint of the humerus
- Outer border of the first rib
- Superior border of the radius
- Lower border of teres major (correct)
Which of the following arteries is NOT part of the arterial supply to the elbow joint?
Which of the following arteries is NOT part of the arterial supply to the elbow joint?
Which of the following correctly describes the boundaries of the cubital fossa?
Which of the following correctly describes the boundaries of the cubital fossa?
Which muscle of the anterior compartment of the forearm is innervated by the ulnar nerve?
Which muscle of the anterior compartment of the forearm is innervated by the ulnar nerve?
Which muscle is located in the deep layer of the anterior compartment of the forearm?
Which muscle is located in the deep layer of the anterior compartment of the forearm?
Identify the muscle that is primarily responsible for pronation of the forearm.
Identify the muscle that is primarily responsible for pronation of the forearm.
Which of the following muscles originates from the medial epicondyle?
Which of the following muscles originates from the medial epicondyle?
What is the primary nerve that innervates the majority of superficial forearm muscles?
What is the primary nerve that innervates the majority of superficial forearm muscles?
Which muscle is primarily responsible for the flexion of the forearm at the elbow joint?
Which muscle is primarily responsible for the flexion of the forearm at the elbow joint?
What is the nerve supply for both the biceps brachii and brachialis muscles?
What is the nerve supply for both the biceps brachii and brachialis muscles?
Which of the following actions is NOT performed by the biceps brachii?
Which of the following actions is NOT performed by the biceps brachii?
From where does the long head of the triceps brachii originate?
From where does the long head of the triceps brachii originate?
Which structure does the musculocutaneous nerve pierce?
Which structure does the musculocutaneous nerve pierce?
Which muscle acts as an accessory flexor of the arm at the shoulder joint?
Which muscle acts as an accessory flexor of the arm at the shoulder joint?
What is the insertion point of the brachialis muscle?
What is the insertion point of the brachialis muscle?
Which of the following muscles does NOT belong to the posterior compartment of the arm?
Which of the following muscles does NOT belong to the posterior compartment of the arm?
Which nerve innervates the muscles in the posterior extensor compartment of the forearm?
Which nerve innervates the muscles in the posterior extensor compartment of the forearm?
What is the primary function of the flexor retinaculum in the forearm?
What is the primary function of the flexor retinaculum in the forearm?
Which of the following structures is located medial to the tendon of biceps brachii in the cubital fossa?
Which of the following structures is located medial to the tendon of biceps brachii in the cubital fossa?
What is the common origin point for most flexors of the forearm?
What is the common origin point for most flexors of the forearm?
Which bone features the radial tuberosity?
Which bone features the radial tuberosity?
Which two pronator muscles are found in the anterior flexor compartment of the forearm?
Which two pronator muscles are found in the anterior flexor compartment of the forearm?
In which region of the ulna is the ulnar notch located?
In which region of the ulna is the ulnar notch located?
What type of joint is the proximal radio-ulnar joint?
What type of joint is the proximal radio-ulnar joint?
Which muscle is responsible for the flexion and abduction of the wrist?
Which muscle is responsible for the flexion and abduction of the wrist?
What is the nerve supply for the Flexor carpi ulnaris?
What is the nerve supply for the Flexor carpi ulnaris?
Which muscle primarily flexes the interphalangeal and metacarpophalangeal joints of the thumb?
Which muscle primarily flexes the interphalangeal and metacarpophalangeal joints of the thumb?
Which muscle originates from the lateral epicondyle of the humerus and helps in wrist extension?
Which muscle originates from the lateral epicondyle of the humerus and helps in wrist extension?
What is the primary action of the Brachioradialis?
What is the primary action of the Brachioradialis?
Which muscles provide the main action of adduction in the hand?
Which muscles provide the main action of adduction in the hand?
Which of the following is correct regarding the innervation of the lumbricals?
Which of the following is correct regarding the innervation of the lumbricals?
The action of the Extensor indicis is to:
The action of the Extensor indicis is to:
Which muscle's action includes the medial rotation of the thumb?
Which muscle's action includes the medial rotation of the thumb?
What joint do the Flexor digitorum profundus and superficialis primarily act on?
What joint do the Flexor digitorum profundus and superficialis primarily act on?
What is the primary action of the Supinator muscle?
What is the primary action of the Supinator muscle?
Which muscle is NOT a part of the posterior compartment of the forearm?
Which muscle is NOT a part of the posterior compartment of the forearm?
Which muscle is responsible for extending and abducting the wrist?
Which muscle is responsible for extending and abducting the wrist?
Flashcards are hidden until you start studying
Study Notes
Muscles of the Arm
- Anterior compartment:
- Biceps brachii: Flexes the forearm at the elbow, supinates the forearm, and flexes the arm at the shoulder.
- Brachialis: Flexes the forearm at the elbow.
- Coracobrachialis: Flexes the arm at the shoulder.
- Posterior compartment:
- Triceps brachii: Extends the forearm at the elbow and also extends and adducts the arm at the shoulder (long head).
- Anconeus: Assists in extending the forearm at the elbow.
- Nerve supply:
- Musculocutaneous nerve: Supplies biceps brachii, brachialis, and coracobrachialis.
- Radial nerve: Supplies triceps brachii and anconeus.
- Arteries:
- Axillary artery: Begins at the outer border of the first rib, continues as the brachial artery.
- Brachial artery: Divides into radial and ulnar arteries below the elbow joint.
Elbow Joint
- Hinge joint: Allows flexion and extension at the elbow.
- Articular surfaces: Between the humerus, ulna, and radius.
- Capsule & ligaments: Stabilize the joint.
- Arterial supply: Brachial, profunda brachii, radial, and ulnar arteries.
- Nerve supply: Musculocutaneous, radial, and ulnar nerves.
Cubital Fossa
- Location: Anterior aspect of the elbow.
- Boundaries:
- Superiorly: Line connecting the medial and lateral epicondyles.
- Medially: Pronator teres and flexor muscles of the forearm.
- Laterally: Brachioradialis and extensor muscles.
- Contents:
- Tendon of biceps brachii
- Brachial artery
- Median nerve
Muscles of the Forearm
- Anterior compartment (Flexors)
- Superficial layer: Pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and flexor digitorum superficialis.
- Deep layer: Pronator quadratus, flexor pollicis longus , and flexor digitorum profundus.
- Posterior compartment (Extensors)
- Superficial layer: Brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor carpi ulnaris, extensor digiti minimi, and anconeus.
- Deep layer: Supinator, extensor pollicis longus, extensor pollicis brevis, and extensor indicis.
- Nerve supply:
- Median nerve: Supplies most of the anterior compartment muscles.
- Ulnar nerve: Supplies flexor carpi ulnaris and the medial half of flexor digitorum profundus.
- Radial nerve: Supplies all posterior compartment muscles.
Muscles of the Hand
- Intrinsic muscles: Located within the hand, responsible for fine motor movements.
- Thenar muscles (thumb): Opponens pollicis, abductor pollicis brevis, flexor pollicis brevis, and adductor pollicis.
- Hypothenar muscles (little finger): Opponens digiti minimi, abductor digiti minimi, and flexor digiti minimi brevis.
- Other intrinsics: Lumbricals and interossei (palmar and dorsal).
Wrist Joint
- Synovial joint: Allows flexion, extension, abduction, and adduction.
- Articular surfaces: Distal end of radius and scaphoid, lunate, and triquetrum.
- Ligaments: Fibrous capsule, dorsal and palmar radio-carpal ligaments, radial and ulnar collateral ligaments.
Radio-ulnar Joints
- Proximal radio-ulnar joint: Between the radius and ulna.
- Distal radio-ulnar joint: Between the radius and ulna.
- Interosseous membrane: Connects the radius and ulna along their shafts.
Applied Anatomy - Subluxation or Pulled Elbow
- Also known as nursemaid's elbow, or pulled elbow
- Occurs when the radial head is pulled out of the annular ligament, usually in young children.
- Commonly happens when a child is abruptly pulled by the hand.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
