Podcast
Questions and Answers
From where does the long head of the triceps brachii muscle arise?
From where does the long head of the triceps brachii muscle arise?
The long head arises from the infraglenoid tubercle of the scapula.
What is the origin of the lateral head of the triceps brachii muscle?
What is the origin of the lateral head of the triceps brachii muscle?
The lateral head arises from an oblique ridge on the upper part of the posterior surface of the humerus, corresponding to the lateral lip of the radial (spiral) groove.
Where does the medial head of the triceps brachii muscle arise from?
Where does the medial head of the triceps brachii muscle arise from?
The medial head arises from a large triangular area on the posterior surface of the humerus below the radial groove, as well as from the medial and lateral intermuscular septa.
What is the insertion point of the long and lateral heads of the triceps brachii muscle?
What is the insertion point of the long and lateral heads of the triceps brachii muscle?
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How is the medial head of the triceps brachii muscle inserted?
How is the medial head of the triceps brachii muscle inserted?
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Where do the thoracic branches of the axillary artery lie in contact with?
Where do the thoracic branches of the axillary artery lie in contact with?
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What prevents nipping of the capsule during extension of the arm?
What prevents nipping of the capsule during extension of the arm?
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What is the course of the circumflex scapular vessels?
What is the course of the circumflex scapular vessels?
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Where do the subscapular vessels run along?
Where do the subscapular vessels run along?
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What is the course of the axillary nerve and the posterior circumflex humeral vessels?
What is the course of the axillary nerve and the posterior circumflex humeral vessels?
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What structures run from the apex to the base along the lateral wall of the axilla?
What structures run from the apex to the base along the lateral wall of the axilla?
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Where do the thoracic branches of the axillary artery lie in contact with?
Where do the thoracic branches of the axillary artery lie in contact with?
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What is the course of the subscapular vessels?
What is the course of the subscapular vessels?
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Where do the circumflex scapular vessels wind round?
Where do the circumflex scapular vessels wind round?
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Study Notes
Triceps Brachii Muscle
- The long head of the triceps brachii muscle arises from the infraglenoid tubercle of the scapula.
- The lateral head of the triceps brachii muscle originates from the posterior surface of the humerus, above the radial groove.
- The medial head of the triceps brachii muscle arises from the posterior surface of the humerus, below the radial groove.
- The long and lateral heads of the triceps brachii muscle insert into the olecranon of the ulna.
- The medial head of the triceps brachii muscle is inserted into the olecranon of the ulna, blending with the tendon of the lateral head.
Axillary Artery and Vessels
- The thoracic branches of the axillary artery lie in contact with the upper four ribs.
- The intermuscular septum prevents nipping of the capsule during extension of the arm.
- The circumflex scapular vessels course around the lateral border of the scapula.
- The subscapular vessels run along the subscapular fossa.
- The axillary nerve and the posterior circumflex humeral vessels course around the surgical neck of the humerus.
Axillary Structures
- The subscapular vessels and the axillary nerve run from the apex to the base along the lateral wall of the axilla.
- The circumflex scapular vessels wind round the lateral border of the scapula.
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Description
This quiz covers the origin of the triceps brachii muscle, including its three heads: long head, lateral head, and medial head. It involves identifying the specific points of origin for each head on the scapula and humerus.
