CRANIAL NERVE, ORBIT PROSECTIONS

2019 FALL

JUGULARFORAMEN –CN IX, X, XI

INTERNALAUDITORYMEATUS –VII, VIII

HYPO-GLOSSALCANAL –CN XII

CRIBRIFORMPLATE ETHMOID - I

OPTIC FORAMEN - II

SUP. ORBITAL FISSURE -III, IV, V1, VI

FORAMEN ROTUNDUM -V2FORAMEN OVALE -V3

SKULL SESSIONS -FORAMINA ASSOCIATEDWITH CRANIAL NERVES

I

II

III

IVV VI

VII+VIII

IX, X+XI XII

V1V2V3

PITUITARYSTALK INTERNAL CAROTID A.

VERTEBRAL A.

MIDDLE MENINGEAL A.

BRAINSTEMDISSECTION IDENTIFY

BASILAR A.

I - OLFACTORY CRIBRIFORMPLATE ETHMOID - I

OPTIC FORAMEN - II

SUP. ORBITAL FISSURE -III, IV, V1, VI

FORAMEN ROTUNDUM -V2FORAMEN OVALE -V3

II - OPTIC

III - OCULOMOTOR

IV - TROCHLEAR

V - TRIGEMINAL

VI - ABDUCENSVertebralartery

Internal Carotidartery

DISSECTION SKULL

LOCATIONOF CAVERNOUSSINUS (Sides ofSella Turcica)

I Olfactory

II Optic

III Oculo-motor IV

Trochlear

V Trigeminal

VI Abducens

VII + VIII

INTERNALCAROTIDA.Pituitary stalk

TentoriumCerebelli

283I Olfactory

II Optic

III Oculo-motor

V Trigeminal

VI Abducens

VII + VIII

INTERNALCAROTIDA.Pituitary stalk

IX, X, XI

VERTEBRALA.

XIi

V Trigeminalunder dura

VI apparently in wrongplace

283

Trigeminal(Semilunar)Genglion

4. Diaphragma Sella – over sella turcica

Tentorial Notch –opening for brainstem

3. Tentorium Cerebelli – forms roof of post. cran. fossa

DURAL REFLECTIONS

view inside cranial cavity

GUIDE TO ORBIT PROSECTIONSSUPERFICIAL DISSECTION -MUSCLES INTACT -V1 branches to face; also muscle of upper eyelid (Lev. Palp. Sup.) , Lacrimal gland

DEEP DISSECTION - Reflect Lev. Palp. Sup., Superior Rectus Muscles;see Optic Nerve, structures entering back of eye (Ciliaryganglion); also V1 branchesto nasal cavity (Ant., Post. Ethmoidal N.)

ORBIT IS DISSECTED FROM FLOOR OF ANTERIOR CRANIALFOSSA

SUPERFICIAL ORBIT

SUPERIORRECTUS

LATERALRECTUS

SUPERIOROBLIQUE

TROCHLEA

MEDIALRECTUS

LACRIMALGLAND

LEVATOR PALPEBRAESUPERIORIS - III, SYMPATHETICS

SUPERFICIAL ORBITseeNERVES (V1)- V1 - Frontaln.: divides to form Supraorbital, SupratrochlearNerves

Muscles - Lev. PalpebraeSuperioris toUpper Eyelid - III +Symp.

Lev. PalpebraeSuperioris M.

SuperiorOblique M.

Superior Rectus M

Frontal N.(V1) - SomaticSensory

Supraorbital N.Supratrochlear N.Somatic Sensory

NOSE

LACRIMALGLAND

TROCHLEAR N.(IV)

Lacrimal N.(V1) -Somatic Sensory

Lev. PalpebraeSuperioris M.

SuperiorOblique M.

Frontal N.(V1) - SomaticSensory

LACRIMALGLAND (VII)

Lacrimal N.(V1) - SomaticSensory

SuperiorRectus M.

SUPERFICIALDISSECTION289(272)

OPHTHALMICARTERYUNDERCN II

REFLECT LEV PALP SUP,SUP. RECTUS.

DEEP ORBIT

REFLECT LEV PALP SUP,SUP. RECTUS.

TROCHLEA OF SUP. OBLIQUE

see OPTIC NERVE

ANTERIOR AND POSTERIOR ETHMOIDAL NERVES (V1)

CILIARYGANGLION- PARA-SYMP. III

LACRIMALGLAND

LONG CILIARY NERVES (V1)

SHORTCILIARYNERVESIII

NOSE

SENSORY - V1 branches - MEDIALPARASYMPATHETIC -III - LATERAL

see OPTIC NERVE

ANTERIOR AND POSTERIOR ETHMOIDAL NERVES (V1) Somatic Sensory

LACRIMALGLAND

SuperiorOblique M.

CILIARYGANGLION- PARA-SYMP. III

SHORTCILIARYNERVESIII (Parasymp.)

LPS +SRmusclesreflected

TrochlearN. (IV)

ANT. AND POST. ETHMOIDAL FORAMINA

DEEP DISSECTION273

SHORT CILIARY NERVES, CILIARY GANGLION (III)

TROCHLEARNERVE (IV)TROCHLEARNERVE (IV)

ANTERIOR ETHMOIDALNERVE (V1)

DEEP DISSECTION273

287

SUPERFICIALORBIT

DEEPORBIT

see OPTIC NERVE

SHORTCILIARYNERVESIII (Parasymp.)

SuperiorOblique M.

Lev. Palp. Sup + Sup. Rec.

FRONT NERVE (V1)SomaticSensory

INFERIOROBLIQUE

TENDONOF SUPERIOROBLIQUE

SuperiorOblique M.ROTATEMEDIALLY(Intorsion)

InferiorOblique M.ROTATELaterally(Extorsion)

NOSE

See why rotation (intorsion, extorsion) occurs

INFERIORRECTUS INFERIOR

OBLIQUE

TROCHLEA OF SUPERIOROBLIQUE

See why rotation (intorsion, extorsion) occurs

OVERVIEW ATLAS PICTURE