Nanatomy of extraocular muscles pdf

These include four rectus muscles, two oblique muscles, and the levator. Anatomy and physiology of extraocular muscles and applied. The movements of the extraocular muscl es take place under the influence of a sys tem of extraocular mu scle pulleys, soft tissue pulleys in the orb it. Embryology of the extraocular muscles and their innervation published on by oxford university press. View anatomy physiology extraocular muscle ppts online, safely and virusfree. The extraocular muscles are innervated by three cranial nerves. Media in category extraocular muscles the following 38 files are in this category, out of 38 total.

Abstract extraocular muscles are classically grouped as four rectus and two. Accident risk of severing of vortex veins during ir and sr rece ssion or resection, io muscle weakening and so muscle tendo n. Comparative anatomy of the extraocular muscles in four. The third cranial nerve, the oculomotor nerve, innervates all the extraocular muscles except the lateral rectus and the superior oblique muscles. Extraocular muscles differ histologically from most other skeletal muscles in that they are made up of 2 different types of muscle cells. There is the seventh extraocular muscle that provides the elevation of the upper eyelid, and that is the levator palpebrae superioris. Pdf assessment of extraocular muscles position and. This video demonstrates the structure and function of the extraocular muscles. Extraocular muscles cranial nerve innervation medical. Anatomy of the orbit and extraocular muscles flashcards. Have the smallest motor unit among skeletal muscles ratio of nerve fibre to muscle fibre is 1.

The superior oblique muscle is innervated by the trochlear nerve cn iv. There are a total of four rectus muscles, two oblique muscles, and the standalone levator palpebrae. The anatomy of the extraocular muscles was studied in 10 adult opossums didelphis albiventris of both sexes. Pdf the medial rectus is one of seven extraocular muscles. Extraocular muscles eye this video was made in collaboration with, check out the related article to consolidation your learning on this topic.

The rectus muscles originate very close one to another between the orbital surfaces. This tutorial covers the anatomy, actions and innervation of the extraoccular eye muscles. Start studying anatomy of the orbit and extraocular muscles. Anatomy, head and neck, eye extraocular muscles statpearls. Note that the rectus muscles pull the eye posteriorly while the oblique muscles pull the eye anteriorly. Pdf normal anatomy and anomalies of the rectus extraocular. Of all of the extraocular muscles, the supe rior oblique has the shortest muscle length 32 mm and the longest tendon length 26 mm, whereas the inferior. The detailed embryologic and histologic features of extraocular muscle tendons from early. The lateral rectus is innervated by the abducens nerve cn vi. Extraocular muscles basic and clinical anatomy lecturio. This will alter the resting gaze of the affected eye. The extraocular muscles eoms bring about eye movement and studies exist which measure eom length, crosssectional diameter and volume.

Lateral rectus is 6th superior oblique is 4th rest are all 3rd cranial nerve. Extraocular muscles cranial nerve innervation lr6so4 rest 3. Eye movements are the result of the action of the extraocular muscles eoms. Damage to one of the cranial nerves will cause paralysis of its respective muscles. The veins from the extraocular muscles correspond to the ar teries and empty into the superior and inferior orbital veins, respectively.