QuestionSBA
QuestionChoice
The triceps brachii is a muscle located on the posterior aspect of the arm and is responsible for extension of the elbow joint. It has three distinct heads: the long head, medial head, and lateral head. The long head, indicated by the arrow, originates from the infraglenoid tubercle of the scapula, playing a role in both elbow and shoulder extension. The lateral head originates from the posterior surface of the humerus, superior to the radial groove, while the medial head arises from the posterior humerus, inferior to the radial groove. All three heads insert via a common tendon onto the olecranon process of the ulna.
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Long head of triceps
QuestionChoice
The lateral head of the triceps originates from the posterior surface of the humerus, superior to the radial groove. The arrow is pointing to a part of the muscle that is more medial than the lateral head.
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b
Lateral head of the triceps
QuestionChoice
The biceps brachii is found in the anterior compartment of the arm. This image shows the posterior compartment. The short head of biceps brachii originates from the coracoid process, whilst the long head originates from the supraglenoid tubercle. Both heads insert onto the radial tuberosity and the fascia of the forearm via the bicipital aponeurosis.
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e
Long head of the biceps
QuestionChoice
The biceps brachii is found in the anterior compartment of the arm. This image shows the posterior compartment. The short head of biceps brachii originates from the coracoid process, whilst the long head originates from the supraglenoid tubercle. Both heads insert onto the radial tuberosity and the fascia of the forearm via the bicipital aponeurosis.
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d
Short head of the biceps
QuestionChoice
The medial head of the triceps originates from the posterior surface of the humerus, inferior to the radial groove. This head is deep to the lateral and long head, so it is not visible in this image.
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c
Medial head of the triceps
Concept
Chapter
2693
5234
Upper arm muscles
Topic
258
Upper Limb Anatomy
20523
Picture
3122
127 - Upper arm muscles (long head of triceps).png
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Topic
258
Upper Limb Anatomy
What part of the muscle is the blue arrow pointing at?

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a