Muscles

Biceps Brachii Origin

The biceps brachii originates from the scapula, specifically at the coracoid process and the supraglenoid tubercle.

Biceps Brachii insertion

is on the radial tuberosity of the radius and the fascia of the forearm.

Biceps Brachii Action

The biceps brachii is responsible for flexion of the elbow and supination of the forearm.

Biceps Brachii Innervation

Musculocutaneous nerve

Biceps Brachii antagonist

Triceps Brachii

Triceps Brachii Origin

Originates from the scapula and humerus.

Triceps Brachii Insertion

Inserts on the olecranon process of the ulna.

Triceps Brachii Action

Extends the elbow joint.

Triceps Brachii Innervation

Innervated by the radial nerve.

Triceps Brachii Antagonist

Biceps Brachii, which flexes the elbow.

Supinator Origin

Lateral epicondyle of the humerus and the ulna

Supinator Insertion

Anterolateral surface of the radius

Supinator Action

It supinates the forearm, allowing the palm to face upward.

Supinator Innvervation

Radial nerve

Supinator Antagonist

Pronator teres or pronator quadratus

Pronator Teres Origin

Medial epicondyle of the humerus

Pronator Teres Insertion

Lateral surface of the radius

Pronator Teres Action

Pronates the forearm

Pronator Teres innervation

Median nerve

Pronator Teres antagonist

Supinator muscle

Sternocleidomastoid origin

Originates from the manubrium of the sternum and the clavicle.

Sternocleidomastoid Insertion

Inserts into the mastoid process of the temporal bone and the superior nuchal line of the occipital bone.

Sternocleidomastoid Action

It rotates and flexes the head and neck.

Sternocleidomastoid Innervation

Innervated by the accessory nerve (CN XI) and cervical plexus.

Iliopsoas Origin

Originates from the iliac fossa, sides of the vertebrae T12-L5, and the sacrum.

Iliopsoas Insertion

Inserts into the lesser trochanter of the femur.

Iliopsoas action

Primarily responsible for hip flexion and stabilization of the hip joint.

Iliopsoas innervation

Innervated by the femoral nerve and lumbar plexus.