Anterior Arm Compartment - Biceps Brachii, Brachialis, & Coracobrachialis

The video tutorial provides an in-depth look at the major muscles of the anterior compartment of the arm, focusing on the biceps brachii, coracobrachialis, and brachialis. It explains their anatomical positions, origins, insertions, functions, and innervations. The biceps brachii is highlighted for its role in elbow flexion and forearm supination, while the coracobrachialis assists in shoulder adduction and flexion. The brachialis is emphasized as the primary muscle for elbow flexion, regardless of forearm position.

What divides the arm into anterior and posterior compartments?

• The scapula and clavicle

• The deltoid and pectoral muscles

• The radius and ulna

• The humerus and two intermuscular septa

Which nerve innervates all the muscles of the anterior compartment of the arm?

• Median nerve

• Musculocutaneous nerve

• Ulnar nerve

• Radial nerve

What is the origin of the long head of the biceps brachii?

• Coracoid process

• Acromion process

• Infraglenoid tubercle

• Supraglenoid tubercle

Where does the biceps brachii tendon insert?

• Ulnar tuberosity

• Deltoid tuberosity

• Radial tuberosity

• Coronoid process

What is the primary function of the coracobrachialis muscle?

• Forearm supination

• Shoulder adduction

• Shoulder abduction

• Elbow flexion

Where does the coracobrachialis muscle insert?

• Medial side of the humerus

• Lateral side of the humerus

• Radial tuberosity

• Ulnar tuberosity

What is the main action of the brachialis muscle?

• Shoulder flexion

• Elbow extension

• Forearm pronation

• Elbow flexion

Which artery supplies blood to the brachialis muscle?

• Axillary artery

• Brachial artery

• Radial artery

• Ulnar artery

In which forearm position is the brachialis most active during elbow flexion?

• Mid-pronation

• All positions

• Pronated

• Supinated

Which muscle is considered the workhorse of elbow flexion?

• Triceps brachii

• Biceps brachii

• Brachialis

• Coracobrachialis