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Questions and Answers
What is the primary function of the caput longum of the muscle?
What is the primary function of the caput longum of the muscle?
Both heads of the muscle contribute to flexion at the elbow joint.
Both heads of the muscle contribute to flexion at the elbow joint.
False
What is the attachment point of the muscle?
What is the attachment point of the muscle?
tuberositas radii
The muscle runs through the shoulder joint in a synovial sheath but is _____ to the synovial membrane.
The muscle runs through the shoulder joint in a synovial sheath but is _____ to the synovial membrane.
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Match the following functions to the respective heads of the muscle:
Match the following functions to the respective heads of the muscle:
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Study Notes
Biceps Brachii Muscle Origin
- Short Head (caput breve): Originates from the superior aspect of the coracoid process, sharing a tendon with the coracobrachialis muscle.
- Long Head (caput longum): Originates from the supraglenoid tubercle and the glenoid labrum.
Biceps Brachii Muscle Course
- The tendon passes through the shoulder joint within its own synovial sheath (intracapsular, but extrasynovial).
- It further runs through the intertubercular groove, where it's secured by the transverse humeral ligament and the terminal fibers of the pectoralis major muscle.
- The two heads fuse into a flattened muscle near the insertion point of the deltoid muscle before attaching to the distal radius.
Biceps Brachii Muscle Insertion
- Attaches to the radial tuberosity.
- A fibrous aponeurosis (lacertus fibrosus) originates from the medial edge of the tendon, spreading across the fascia antebrachii.
Function of Biceps Brachii
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At the shoulder joint:
- Long Head: Stabilizes the shoulder.
- Short Head: Abducts the arm.
- Both Heads: Flexes and externally rotates the arm.
-
At the elbow joint:
- Flexion, particularly with the forearm in a supinated position.
- Supination.
Biceps Brachii Innervation
- Innervated by the musculocutaneous nerve, originating from spinal roots C5-6.
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Description
Test your knowledge on the origin, course, insertion, and function of the Biceps Brachii muscle. This quiz covers anatomical details including muscle heads and their respective attachments. Ideal for students in anatomy or physiology courses.
