OPT 114: Orbit - Contents

Globe (Eye, eyeball)

consists of 3 coats and 3 chambers

contents of outer fibrous layer

cornea and sclera

contents of middle vascular layer (uvea)

iris, ciliary body, choroid

contents of inner neural layer

retina

What are the 3 chambers in the globe?

anterior, posterior, vitreous

another name for tenon's capsule

bulbar fascia

tenon's capsule

sheet of dense connective tissue that covers the sclera; covers tendons of the extraocular muscles as they insert into the sclera; provides a strong barrier; separates the globe from the contents of the orbit; prevents orbital infections from entering the globe

what does the tenon's capsule merge with anteriorly?

sclera and conjunctiva at limbus

what is the tenon's capsule continuous with posteriorly?

dural sheath of the optic nerve

conjunctiva; tenon's capsule; sclera

What's "1", "2", "3", respectfully?

another name for the orbital septum

palpebral fascia

orbital septum

sheet of dense connective tissue that extends from the entire rim of the orbit to the tarsal plate; anterior barrier of the orbit; separates the eyelids and lacrimal sac from the orbit; prevents facial/eyelid/nasolacrimal system infections from entering the orbit; keeps orbital fat in place

The orbital septum is continuous with the ____________ at the superior and inferior orbital rim.

periosteum

orbital septum

What's "1"?

orbital septum

What's "8"?

periorbita (orbital fascia, periosteum)

sheet of dense connective tissue that covers the bones of the orbit; attachment site for muscles, tendons, and ligaments as well as support structure for vascular supply to the orbital bones

anteriorly, the periorbita is continuous with the periosteum of _________ ________ and _______ _____.

facial bones; orbital septum

posteriorly, the periorbita is continuous with the _______ _______ of the ________ _______ and forms the _______ ____________ _____.

dural sheath; optic nerve; common tendinous ring

periorbita

What's "9"?

whitnall's ligament

transverse dense connective tissue located in the orbit; courses from lateral orbit wall to medial orbit wall; provides support and maintains spatial relationships between anatomic structures in the superior orbit; formed by the condensation of the levator muscle; where levator muscle fibers end and the levator aponeurosis begins

another name for whitnall's ligament

superior transverse ligament

lockwood's ligament

transverse dense connective tissue located in the inferior orbit; courses from lateral orbital wall to medial orbital wall; provides support and maintains spatial relationships between anatomic structures in the inferior orbit; contributes to the formation of the capsulopalpebral fasica

another name for lockwood's ligament

suspensory ligament

whitnall's ligament; lockwood's ligament

What's "1" and "2", respectfully?

medial check ligament

transverse dense connective tissue that is an expansion of the sheath of the medial rectus; attaches to the lacrimal bone; prevents overaction of the medial rectus

lateral check ligament

transverse dense connective tissue that is an expansion of the sheath of the lateral rectus; attaches to the zygomatic bone; prevents overaction of the lateral rectus

medial check ligament; lateral check ligament

What's "1" and "2", respectfully?

__________, __________, and ________ form a supporting hammock-like formation for the globe

whitnall's ligament; lockwood's ligament; the check ligaments

orbital septum system

web of interconnecting connective tissue septa; organizes the orbital space surrounding the globe; anchors and supports extraocular muscles, nerves, and blood vessels

orbital septum system

What's "1"?

orbital nerves

optic nerve (II), oculomotor nerve (III), trochlear nerve (IV), ophthalmic nerve (V1), maxillary nerve (V2), abducens nerve (VI)

blood vessels

ophthalmic artery and its branches; superior and inferior ophthalmic vein and its branches

ophthalmic artery

What's the blank?

superior ophthalmic vein; inferior ophthalmic vein

What's "1" and "2", respectfully?

extraocular muscles

control movement of the globe

2 types of extraocular muscles

recti and oblique

recti muscles

superior, inferior, medial, lateral - rectus

oblique muscles

superior and inferior - oblique

eyelid retractors

control movement of the eyelids

eyelid retractors examples

levator palpebrae, superior & inferior tarsal muscles, capsulopalpebral fascia

another name for superior tarsal muscle

Muller's muscle (an eyelid retractor)

superior rectus; superior oblique; medial rectus; inferior rectus; inferior oblique; lateral rectus

What's "1","2","3","4","5", and "6" respectfully?

levator palpebrae superioris muscle

What's "1"?

capsulopalpebral fascia

What's "2"?

orbital fat

space not occupied by orbital structures becomes filled with adipose tissue; predominant tissue in orbital apex; surrounds the optic nerve, separating it from the extraocular muscles; separates the muscles in the orbit from the orbital walls

In the anterosuperior orbit, __ fat pads are anterior to the levator aponeurosis. They are _____ and _____.

2; nasal; central

Anteriorly and inferiorly, ___ fat pads are posterior to the orbital septum and anterior to the capsulopalpebral fascia. They are _______, ________, and ______.

3; nasal; central; temporal

The fat pads are held in place by the _________ __________.

orbital septum

preaponeurotic fat pads

2 fat pads in the anterosuperior orbit

preaponeurotic fat pad, nasal fat pad, central fat pad, temporal fat pad

What's "1", "2", "3", and "4", respectfully?