Podcast
Questions and Answers
What is the action of the short head of the biceps brachii muscle?
What is the action of the short head of the biceps brachii muscle?
What is the termination of the brachial artery?
What is the termination of the brachial artery?
What is the nerve supply of the lateral part of the brachialis muscle?
What is the nerve supply of the lateral part of the brachialis muscle?
What is the largest branch of the brachial artery?
What is the largest branch of the brachial artery?
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Which muscle is supplied by the muscular branches of the lateral cutaneous nerve?
Which muscle is supplied by the muscular branches of the lateral cutaneous nerve?
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What is the origin of the lateral root of the median nerve?
What is the origin of the lateral root of the median nerve?
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Where does the ulnar nerve pierce the medial intermuscular septum?
Where does the ulnar nerve pierce the medial intermuscular septum?
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Which head of the triceps brachii originates from the infraglenoid tubercle of the scapula?
Which head of the triceps brachii originates from the infraglenoid tubercle of the scapula?
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What is the course of the median nerve after it crosses the brachial artery from lateral to medial?
What is the course of the median nerve after it crosses the brachial artery from lateral to medial?
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Study Notes
Anterior Compartment
- Biceps Brachii:
- Origin: 2 heads (long head from supraglenoid tubercle of scapula, short head from tip of coracoid process)
- Insertion: biceps tendon into posterior rough part of radial tuberosity, bicepital aponeurosis into deep fascia of forearm
- Nerve supply: musculocutaneus nerve
- Action: flexor of elbow, supinator when elbow is flexed, stabilizes head of humerus in glenoid cavity
- Coracobrachialis:
- Origin: tip of coracoid process
- Insertion: middle of medial border of humerus
- Nerve supply: musculocutaneus nerve
- Action: flexion and weak adduction of arm
- Brachialis:
- Origin: lower half of front of humerus, lateral and medial intermuscular septa
- Insertion: ulnar tuberosity
- Nerve supply: medial part by musculocutaneus nerve, lateral part by radial nerve
- Action: flexion of elbow joint
- Brachial Artery:
- Origin: continuation of axillary artery at lower border of teres major
- Course: descends downwards and laterally from medial side of humerus to front of arm
- Termination: divides into radial and ulnar arteries opposite neck of radius
- Branches: profunda brachii, nutrient artery of humerus, superior ulnar collateral, inferior ulnar collateral, muscular branches
- Musculocutaneus Nerve:
- Origin: continuation of lateral cord of brachial plexus (C5, 6, 7)
- Course: descends downward and laterally, lateral to 3rd part of axillary artery
- Branches: muscular branches to biceps brachii, brachialis, coracobrachialis, articular to elbow joint, lateral cutaneous nerve of forearm
- Median Nerve:
- Origin: by 2 roots (lateral root from lateral cord of brachial plexus, medial root from medial cord)
- Course: medial root crosses in front of 3rd part of axillary artery, unites with lateral root, runs downward on lateral side of brachial artery
- No branches in arm
- Ulnar Nerve:
- Origin: medial cord of brachial plexus (C8, T1)
- Course: runs downward on medial side of brachial artery, pierces medial intermuscular septum, descends in front of medial head of triceps
- No branches above the elbow
Posterior Compartment
- Triceps Brachii:
- Origin: 3 heads (long head from infraglenoid tubercle of scapula, lateral head from posterior surface of shaft of humerus, medial head from posterior surface of shaft of humerus)
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Description
Learn about the origin, insertion, nerve supply, and action of the Biceps Brachii muscle in the anterior compartment.
