Podcast
Questions and Answers
Which nerve innervates all three muscles (biceps brachii, coracobrachialis, and brachialis) in the anterior compartment of the upper arm?
Which nerve innervates all three muscles (biceps brachii, coracobrachialis, and brachialis) in the anterior compartment of the upper arm?
- Musculocutaneous nerve (correct)
- Radial nerve
- Ulnar nerve
- Axillary nerve
The biceps brachii muscle directly attaches to the humerus bone.
The biceps brachii muscle directly attaches to the humerus bone.
False (B)
What arterial structure provides the primary blood supply to the posterior compartment of the upper arm?
What arterial structure provides the primary blood supply to the posterior compartment of the upper arm?
profunda brachii artery
The connective tissue sheet extending from the biceps brachii tendon, which forms the roof of the cubital fossa, is called the ______ aponeurosis.
The connective tissue sheet extending from the biceps brachii tendon, which forms the roof of the cubital fossa, is called the ______ aponeurosis.
Match the muscle with its location:
Match the muscle with its location:
A patient presents with a visible bulge in their upper arm when flexing the elbow, known as the 'Popeye Sign'. Which tendon rupture is most likely the cause?
A patient presents with a visible bulge in their upper arm when flexing the elbow, known as the 'Popeye Sign'. Which tendon rupture is most likely the cause?
Following a complete rupture of the long head of the biceps brachii tendon, a patient will likely experience significant and debilitating weakness in upper limb flexion.
Following a complete rupture of the long head of the biceps brachii tendon, a patient will likely experience significant and debilitating weakness in upper limb flexion.
Name the anatomical region located anterior to the elbow, where the bicipital aponeurosis forms the roof and the brachialis muscle forms the floor.
Name the anatomical region located anterior to the elbow, where the bicipital aponeurosis forms the roof and the brachialis muscle forms the floor.
Which of the following muscles is located most distally in the anterior compartment of the upper arm and forms the floor of the cubital fossa?
Which of the following muscles is located most distally in the anterior compartment of the upper arm and forms the floor of the cubital fossa?
The triceps brachii muscle, located in the posterior compartment of the upper arm, is unique due to having ______ heads.
The triceps brachii muscle, located in the posterior compartment of the upper arm, is unique due to having ______ heads.
Flashcards
Upper Arm Location
Upper Arm Location
Located between the shoulder and elbow joints, containing muscles in anterior and posterior compartments.
Anterior Upper Arm Muscles
Anterior Upper Arm Muscles
Biceps brachii, coracobrachialis, and brachialis, all innervated by the musculocutaneous nerve.
Arterial Supply (Anterior Upper Arm)
Arterial Supply (Anterior Upper Arm)
Via muscular branches of the brachial artery.
Biceps Brachii
Biceps Brachii
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Bicipital Aponeurosis
Bicipital Aponeurosis
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Brachialis Muscle
Brachialis Muscle
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Popeye Sign
Popeye Sign
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Posterior Upper Arm Compartment
Posterior Upper Arm Compartment
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Triceps Brachii (Medial Head)
Triceps Brachii (Medial Head)
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Arterial Supply (Posterior Upper Arm)
Arterial Supply (Posterior Upper Arm)
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Study Notes
- The upper arm is between the shoulder and elbow joints.
- The upper arm contains four muscles.
- Three muscles are in the anterior compartment: biceps brachii, brachialis, and coracobrachialis.
- One muscle is in the posterior compartment: triceps brachii.
Anterior Compartment Muscles
- The anterior compartment contains biceps brachii, coracobrachialis, and brachialis.
- The musculocutaneous nerve innervates all three anterior compartment muscles.
- "BBC" is a mnemonic for remembering the anterior compartment muscles.
- The brachial artery supplies the anterior compartment.
- The biceps brachii has two heads.
- The biceps brachii does not attach to the humerus.
- The bicipital aponeurosis is a connective tissue sheet from the biceps brachii tendon.
- The bicipital aponeurosis forms the roof of the cubital fossa.
- The coracobrachialis is deep to the biceps brachii.
- The brachialis is deep to the biceps brachii and more distal.
- The brachialis forms the floor of the cubital fossa.
- A rupture of the long head of the biceps brachii is a common tendon rupture.
- A biceps brachii rupture causes a bulge when flexing the elbow, known as the 'Popeye Sign'.
- The brachialis and supinator muscles compensate for weakness from a biceps brachii rupture.
Posterior Compartment Muscles
- The posterior compartment contains the triceps brachii.
- The triceps brachii has three heads.
- The medial head of the triceps brachii is deep to the other two heads.
- The profunda brachii artery supplies the posterior compartment.
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Description
Overview of the anterior compartment muscles of the upper arm, including the biceps brachii, coracobrachialis, and brachialis. Covers innervation by the musculocutaneous nerve and blood supply from the brachial artery. Includes details on attachments and the bicipital aponeurosis.
