AP BIOLOGY

Detailed explanation-1: -The superior rectus muscle is a muscle in the orbit. It is one of the extraocular muscles. It is innervated by the superior division of the oculomotor nerve (III). In the primary position (looking straight ahead), its primary function is elevation, although it also contributes to intorsion and adduction.

Detailed explanation-2: -The superior oblique muscle is situated in the upper medial portion of the orbit, adjacent to its medial wall. The muscle is located superior to medial rectus and medial to both the superior rectus and levator palpebrae superioris muscles.

Detailed explanation-3: -The pectoralis major is the superior most and largest muscle of the anterior chest wall.

Detailed explanation-4: -Superior rectus is one of the extrinsic muscles of the eye. Being located outside the eyeball but within the orbit, it belongs to a group called the extraocular muscles. This group of muscles serves to move the eyes within the orbit.