*6.1 Systems in the NS, Sensory I - VISUAL SYSTEM and upper cranial nerves (HARC) Flashcards
OPTIC NERVE RECEIVES SENSORY INFORMATION from the EYE and takes it TO the…
OPTIC CHIASMA
-> OPTIC TRACT
from the Optic Chiasma the OPTIC TRACT will take the Information TO … and where will it go from there
OPTIC TRACT ->
to LATERAL GENICULATE BODY (THALAMUS)
-> OPTIC RADIATION
and then to the OCCIPITAL LOBE
what FEILDS of VIEW are RECEIVED at the EYES
TEMPORO VISUAL FIELD - LATERAL
NASAL VISUAL FIELD - MIDDLE
at the OPTIC CHIASMA the information either DECUSSATES (crosses over and forms X shape) or some stays IPSILATERAL (on the same side)
which FIELDS of VIEW INFORMATION DECUSSATE and which stay IPSILATERAL
DECUSSATES : LATERAL, TEMPORO VISUAL FIELD
IPSILATERAL: MIDDLE, NASAL VISUAL FIELD
where does OCCULOMOTOR NERVE ORIGINATE
VENTRAL MIDBRAIN
OCCULOMOTOR NERVE is at the LEVEL of the …. (anatomical landmark)
SUPERIOR COLLICULUS
The SUPERIOR BRANCH of the OCCULOMOTOR SUPPLIES which MUSCLES
SUPERIOR RECTUS & LEVATOR PALPEBRAE SUPERIOSIS
INFERIOR BRANCH of the OCCULMOTOR SUPPLIES which MUSCLES
INFERIOR RECTUS, MEDIAL RECTUS, INFERIOR OBLIQUE
OCCULOMOTOR SUPERIOR and INFERIOR BRANCHES supply how many MUSCLES each
Superior : 2
Inferior: 3
TROCHLEAR NERVE (4) is at the LEVEL of the …
INFERIOR COLLICULUS (in LOWER MIDBRAIN)
TROCHLEAR NERVE EXITS which way (ventral or dorsal)
DORSALLY - POSTERIOR
TROCHLEAR NERVE INNERVATES which MUSCLE (MOTOR)
SUPERIOR OBLIQUE
(depression of eye)
where is the ABDUCENS NERVE (6) LOCATED
at INFERIOR portion of the PONS
at PONTOMEDULLARY JUNCTION
ABDUCENS NERVE has only SOMATIC MOTOR Neurons to INNERVATE which MUSCLE
LATERAL RECTUS MUSCLE
(abduction)
LAVATOR PALPEBRAE SUPERIORIS (elevate eyelid) is INNERVATED by which NERVE
OCCULOMOTOR
- SUPERIOR BRANCH
SUPERIOR OBLIQUE (depress eyeball, medial rotation, abduction) is INNERVATED by which NERVE
TROCHLEAR NERVE
(its Fibres pass the TROCHLEAR)
INTERNAL OBLIQUE (elevate eyeball, lateral rotation, abduction) is INNERVATED by which NERVE
OCCULOMOTOR (3)
- INFERIOR BRANCH
what is at the LEVEL of the SUPERIOR COLLICULUS
OCCULOMOTOR NERVE
what is at the LEVEL of the INFERIOR COLLICULUS
TROCHLEAR NERVE
what is at the PONTOMEDULLARY JUNCTION
ABDUCENS NERVE
(& Vestibulocochlear
& Facial)
MEDIAL RECTUS (adduction) is INNERVATED by which NERVE
OCCULOMOTOR
- INFERIOR BRANCH
LATERAL RECTUS (abduction) is INNERVATED by which NERVE
ABDUCENS
INFERIOR RECTUS (depress eye) is INNERVATED by which NERVE
OCCULOMOTOR
- INFERIOR BRANCH
which NERVE EXITS DORSALLY
TROCHLEAR NERVE
which NERVE has ONLY SOMATIC MOTOR NEURONS (VOLUNTARY movement)
ABDUCENS
which MUSCLES FIBRES PASS the TROCHLEAR
SUPERIOR OBLIQUE (from trochlear nerve)
which MUSCLE appears the HIGHEST / most superior
SUPERIOR OLIQUE
then Lavator Palpebrae Superiosis
then Superior Rectus below
the 4 RECTI MUSCLES ORIGINATE from …. RING
COMMON TENDONOUS RING
FUNCTIONS of the SUPERIOR RECTUS muscle (innervated by OCCULOMOTOR)
ELEVATES EYES (look up)
MEDIAL ROTATION/INTORSION
ADDUCTION (pulls towards midline)
FUNCTIONS of the INFERIOR RECTUS muscle (innervated by OCCULOMOTOR)
DEPRESSES EYES (look down)
LATERAL ROTATION / INTORSION
ADDUCTION
FUNCTIONS of the MEDIAL RECTUS muscle (innervated by OCCULOMOTOR)
ADDUCTION
FUNCTIONS of the LATERAL RECTUS muscle (innervated by ABDUCENS)
ABDUCTION
FUNCTIONS of the SUPERIOR OBLIQUE muscle (innervated by TROCHLEAR)
DEPRESSION
ABDUCTION
MEDIAL ROTATION/INTORSION
FUNCTIONS of the INFERIOR OBLIQUE muscle (innervated by OCCULOMOTOR)
ELEVATE
ABDUCTION
LATERAL ROTATION/EXTORSION
which EYE MUSCLES cause ADDUCTION
MEDIAL RECTUS
SUPERIOR RECTUS
INFERIOR RECTUS
which EYE MUSCLES cause ABDUCTION
LATERAL RECTUS
SUPERIOR OBLIQUE
INFERIOR OBLIQUE
which MUSCLE ELEVATES the EYELID (not eye)
LEVATOR PALPEBRAE SUPERIOSIS
(from superior branch of Occulomotor)
which EYE MUSCLES cause ELEVATION of EYES - LOOK UP
SUPERIOR RECTUS
INFERIOR OBLQUE
which EYE MUSCLES cause DEPRESSION of EYES - LOOK DOWN
INFERIOR RECTUS
SUPERIOR OBLIQUE
which EYE MUSCLES cause MEDIAL ROTATION / INTORSION
SUPERIOR RECTUS
SUPERIOR OBLIQUE
(NOT medial rectus)
which EYE MUSCLES cause LATERAL ROTATION / EXTORSION
INFERIOR RECTUS
INFERIOR OBLIQUE
(NOT lateral rectus)
COMMON ACTION between the SUPERIOR and INFERIOR OBLIQUES
ABDUCTION
COMMON ACTION between the SUPERIOR and INFERIOR RECTUS
ADDUCTION
what ROTATION does SUPERIOR OBLIQUE cause
MEDIAL ROTATION / INTORSION
(&abduct)
what ROTATION does INFERIOR OBLIQUE cause
LATERAL ROTATION / EXTORSION
(&abduct)
what ROTATION does SUPERIOR RECTUS cause
MEDIAL ROTATION / INTORSION
(&adduct)
what ROTATION does INFERIOR RECTUS cause
LATERAL ROTATION / EXTORSION
where in the BRAIN are the PRIMARY & SECONDARY VISUAL CORTEX where the sensory information from the optic nerve (optic chiasm, optic tract, optic radiation) is carried to FROM THE EYE
OCCIPITAL LOBE
