Muscles Origin and Insertion

longissimus capitis

Longissimus capitis arises from the transverse processes of the first 4-5 thoracic vertebrae (T1-T5), and ascends superiorly across the lateral surface of the semispinalis capitis muscle. ... It inserts into the accessory and transverse processes of vertebra L5. the longissimus capitis muscle can laterally flex the head and rotate it to the same side.

trapezius muscle

Moves the head and shoulder blade. It originates on the occipital bone, the ligamentum nuchae, and the spinous processes of T01-T12. The trapezius inserts on the lateral third of the clavicle, as well as the acromion and scapular spine of the scapula.

frontalis muscle

The frontalis muscle originates at the anterior, or front, of the galea aponeurotica, which is near the top of the forehead. The frontalis muscle passed through and inserted into the bundles of the orbicularis oculi muscle on the superior border of the eyebrow at middle and medial side of the upper eyelid. Controls forehead and eyebrows

latissimus dorsi

Origin of the latissimus dorsi is from spinous processes of thoracic T7-T12, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs, inferior angle of scapula and insertion on floor of intertubercular groove of the humerus. The latissimus dorsi is responsible for extension, adduction, transverse extension also known as horizontal abduction, flexion from an extended position, and (medial) internal rotation of the shoulder joint.

Infraspinatus

The infraspinatus originates from the infraspinous fossa of the scapula (shoulder blade). ... From this location, the infraspinatus muscle travels upward diagonally and inserts onto the greater tubercle of the humerus. the main function of the infraspinatus is to externally rotate the humerus and stabilize the shoulder joint.

orbicularis oculi

The orbicularis oculi originates (begins) from the front surface of the orbital margin, which is the rim of the eye socket. ... The orbicularis oculi muscle inserts onto the lateral palpebral raphe which is located on the outer part of each eye socket. The orbicularis oculi is a muscle in the face that closes the eyelids.

rhomboid major

The rhomboid major arises from the spinous processes of the thoracic vertebrae T2 to T5 as well as the supraspinous ligament. It inserts on the medial border of the scapula. The main action of the rhomboid major muscle is to retract and elevate the inner border of the scapula.

teres major

The teres major originates from the outer border and inferior angle of the scapula. From these points of origin, the teres major muscle runs under the shoulder joint and inserts (attaches) to the top of the humerus, which is the long bone that makes up the upper arm. The teres major causes three movements in the shoulder joint