Questions and Answers
Which nerve lies medial to the vessels in the arm?
What is the primary action of the triceps muscle?
Which branch supplies the skin on the medial side of the forearm?
Which head of the triceps arises from the infraglenoid tubercle of the scapula?
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What is the function of the intermuscular septa?
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Which nerve supplies the triceps muscle?
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Which of the following muscles is NOT located in the posterior compartment of the arm?
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What is the outcome when testing the functioning of the triceps?
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Which nerve is primarily responsible for innervating the biceps brachii?
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What is the primary artery supplying the anterior compartment of the arm?
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What is the primary function of the intermuscular septa in the arm?
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Which of the following muscles performs flexion at the elbow joint?
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Where does the long head of the biceps brachii muscle originate?
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Which structure is formed by the merging of both heads of the biceps brachii just above the elbow joint?
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What is the primary role of the basilic and cephalic veins in the arm?
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The radial tuberosity is the insertion point for which muscle?
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What is the function of the medial intermuscular septum?
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Which nerve is NOT associated with the medial intermuscular septum?
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In relation to the brachial artery, where is the median nerve positioned above the artery?
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Which of the following nerves pierces the lateral intermuscular septum?
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What is the primary action of the brachialis muscle?
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At what point does the brachial artery divide into the radial and ulnar arteries?
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Which vein ascends laterally and ends by piercing the clavipectoral fascia?
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Where does the basilic vein perforate the deep fascia in the arm?
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Study Notes
Medial Intermuscular Septum
- Fibrous structure attached along the medial supracondylar ridge of the humerus.
- Extends proximally behind the coracobrachialis muscle insertion.
- Provides origin for most medial fibers of brachialis and the medial head of triceps.
- Pierced by the ulnar nerve, superior ulnar collateral artery, and radial nerve.
Lateral Intermuscular Septum
- Fibrous structure attached along the lateral supracondylar ridge of the humerus.
- Pierced by the radial nerve and profunda brachii artery.
Anterior Compartment Muscles
- Includes Biceps Brachii, Coracobrachialis, and Brachialis.
Anterior Compartment Vessels
- Brachial Artery: Continuation of the axillary artery; transitions position relative to the median and ulnar nerves throughout the arm and bifurcates into radial and ulnar arteries at the cubital fossa.
- Basilic Vein: Perforates deep fascia mid-arm, ascends medially to form the axillary vein.
- Cephalic Vein: Located in the groove between the deltoid and pectoralis major, ascends laterally to enter axillary vein.
Biceps Brachii
- Comprises two heads: Long head and Short head.
- Long Head: Originates from the supraglenoid tubercle and glenoid labrum, tendon traverses the shoulder joint.
- Short Head: Arises from the apex of the coracoid process near the coracobrachialis.
Biceps Brachii Insertion
- Both heads merge above the elbow, forming a flattened muscle belly that inserts on the posterior border of the radial tuberosity.
- Features a medial expansion known as the Bicipital Aponeurosis, which consists of flat, broad tendons.
Anterior Compartment Nerves
- Median Nerve and Musculocutaneous Nerve: Main nerves serving anterior muscles.
- Ulnar Nerve: Supplies medial features and sensory functions.
- Medial Cutaneous Nerve of Arm: Supplies skin on the front and medial side of the arm.
- Medial Cutaneous Nerve of Forearm: Supplies skin over the medial side of the forearm.
- Intercostobrachial Nerve: Supplies the skin of the axilla and medial upper arm.
Posterior Compartment Muscles
- Comprises Triceps Brachii and Anconeus.
- Triceps Brachii: Contains three heads; Long head, Lateral head, and Medial head.
- Long Head: Originates from the infraglenoid tubercle of the scapula.
- Lateral Head: Linear origin from back of the humerus above radial nerve groove.
- Medial Head: Originates below the radial groove on the humerus, inserting on the olecranon.
Triceps Brachii Function
- Acts as elbow joint extensor.
- The Long head aids in stabilizing the shoulder capsule during arm abduction.
- Testing the triceps involves extending a flexed forearm against resistance.
Triceps Nerve Supply
- Innervated by the Radial Nerve, specifically C7 and C8 spinal levels.
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Description
Explore the anatomy and function of the medial and lateral intermuscular septa. This quiz focuses on their attachments, the structures they affect, and the nerves and arteries involved. Test your knowledge of muscle anatomy!
