Lecture 10-11 PNS Flashcards by Rebecca Rechlin

CNI

Name: Olfactory
Type: Sensory
Target: Nose
Passes through: Cribiform plate (part of ethmoid).
Sense of smell

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CNII

Name: Optic Nerve
Type: Sensory
Target: Eyeball
Passes through: Optic canal

sense of sight

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CNIII

Name: oculomotor
Type: Motor and PSN
Target: contracts muscles which move eyeball (4/6). Also constricts pupils
Passes through: SOF

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CNIV

Name: trochlear
Type: motor
Target: 1 muscle which moves eyeball
Passes through: SOF

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CNV

Name: Trigeminal. divides into 3 branches
Type: motor and sensory
Target: all skin of face, sensory. Mandibular nerve carries motor for mastication muscles

Passes through: SOF (ophamalic division), rotundum foramen (Maxillary) AND Oval foramen (Mandibular)

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CNVI

Name: abducent
Type: motor
Target: muscle of eyeball
Passes through: SOF

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CNVII

Name: Facial
Type: motor, sensory, PSN
Target: superficial muscles of face, change facial expressions (motor), sensory fibres target anterior two thirds of tongue, PSN target salivary and lacrimal glands

Passes through: Internal Acoustic Meatus

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CNVIII

Name: Vestibulocochlear
Type:sensory
Target: sense of hearing (cochlea) and sense of balance (vestibule)
Passes through: internal acousitc meatus

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CNIX

Name:Glossopharyngeal
Type:Mixed
Target: motor fibres supply 1 muscle in pharynx
sensory fibres target posterior third of tongue and general sense from area. also reaches pharynx, picks up general sense
Passes through: jugular foramen

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CNXI

Name: Accessory Nerve
Type: Motor
Target: sternoclaval mastoid and trapezius muscles
Passes through: Jugular foramen

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CNX

Name: Vagus
Type:Mixed
Target: motor fibres to muscle of pharynx/larynx
sensory fibres supply larynx
PSN fibres supply all thoracic viscera, most abdominal

Passes through: jugular foramen

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CNXII

Name: hypoglossal
Type: motor
Target: muscles of tongue, all but 1
Passes through: bony tunnel (hypoglossal canal)

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which nerves supply pharynx?

CNX(Vagus) supplies motor to pharynx

CNIX (glossopharyngeal) is sensory to pharynx

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somatic plexus

ventral rami of spinal nerves form it

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visceral (autonomic) plexus

autonomic nerve fibers form

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cervical plexus

formed by ventral rami of spinal nerves C1-C4

cutaneous Bb.= sensory skin of neck, part of head

motor: Ansa cervicalis (most infrahyoid muscles) and phrenic (diaphragm)

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brachial plexus

supplires upper limb. formed of ventral rami of spinal nerves C5-T1

3 trunks (Upper, Mid, Lower) which divide into
anterior and posterior divisions

Divisions come together to form Cords:
Lateral (union of anterior divisionsof upper and middle trunks)
Posterior Cord (union of posterior divisions)
and Medial Cord

cords become branches
*Musculocutaneous Branch: from lateral cord. anterior arm muscles and lateral skin of forearm

*Radial Nerve (largest): from posterior corf. Muscles of posterior arm and forearm. Skin of back of arm, forearm, hand (largest sensory)

*UInar Nerve: frommedial cord
Muscles of hand. skin of medial 1/3 of hand (palm, back, medial 1.5 fingers). fine movement

*Median Nerve:from median and lateral cord. Motor supply to most muscles of anterior forearm and muscles of hand. sensory to lateral 2/3 of palm of hand and lateral 3.5 fingers

lumbar plexus

formed by ventral rami of spinal nerves L1-L4. innervate muscle and skin of lower limb

Lateral Femoral Posterior division *sensory to skin on lateral side of thigh

Femoral Posterior division *supplies all muscles of anterior thigh. sensory to parts of thigh skin and medial side of leg

Obturator anterior division * muscles to medial muscles of thigh
Sensory to medial skin of thigh

sacral plexus

formed by union of ventral rami of spinal merves L4-S4 in front of posterior pelvic wall. unites to form lumbosacral trunk that contibures to sacral plexus. supply majority of muscles and skin of lower limb

coccygeal plexus

formed by ventral rami of spinal nerves S5 and Co, and minor contribution rfom S4. located above pelvic floor and supplies part of pelvic floor muscularture btw tip of coccyx and anus

what is a plexus

nerve network formed by ventral rami of spinal nerves

what type of fibres to dorsal rami carry? ventral rami?

both carry mixed (sensory and motor)

where does the dorsal ramus extent to

back muscles and skin covering back muscles

what are the 4 major plexi of ventral root

Cervical (C1-C4)
Brachial (C5-T1)
Lumbar (L1-L4)
Saccral (L4-C0)

what plexi are in the thoracic region

NONE> because of ribs instead there are intercostal nerves which are ventral rami of thoracic spinal nerves

Median Branch

Brachial plexus *Median Nerve:from median and lateral cord. Motor supply to most muscles of anterior forearm and muscles of hand. sensory to lateral 2/3 of palm of hand and lateral 3.5 fingers

Ulnar Branch

Brachial plexus *UInar Nerve: frommedial cord Muscles of hand. skin of medial 1/3 of hand (palm, back, medial 1.5 fingers). fine movement

Radial Branch

Brachial plexus *Radial Nerve (largest): from posterior corf. Muscles of posterior arm and forearm. Skin of back of arm, forearm, hand (largest sensory

Musculocutaneous Branch

Brachial plexus *Musculocutaneous Branch: from lateral cord. anterior arm muscles and lateral skin of forearm

obturator plexus

Obturator anterior division * muscles to medial muscles of thigh Sensory to medial skin of thigh

femoral plexus

Femoral Posterior division *supplies all muscles of anterior thigh. sensory to parts of thigh skin and medial side of leg

Lateral Femoral plexus

Lateral Femoral Posterior division *sensory to skin on lateral side of thigh

components of sacral plexus

Superior gluteal Inferior gluteal Sciatic (common fibular and tibial) Pudendal

Superior and inferior gluteal branches

part of sacral plexus supply gluteal muscles

sciatic branch

part of sacral plexus 2 components 1: Common fibular- muscles of anterior and lateral leg and muscles of dorsum on foot. sensory to skin on latearl elg and dorsum of foot 2. Tibial- muscles of back of thigh and leg and all muscles of plantar foot skin of back f leg and plantar foot

Pudendal Branch

sacral plexus sensory to skin of external genitalia muscles of pelvic floor (perineal)

1. Cervical Plexus 2. Brachial Plexus 3> Intercostal Nerves 4. Lumbar Plexus 5. Sacral Plexus

which plexus is this? label the branches

Cervical Plexus top: cutaneous (sensory skin of neck,head) mid: ansa cervicalis (motor infrahyoid muscles) bottom: phrenic (motor, diaphragm) CERVICAL= CAP

which plexus is this? label the branches

Brachial 1. Musculocutaneous (ant. arm muscles, lat. skin forearm) 2. Median (muscles of ant. forearm, muscles of hand. sensory to lat. 2/3 palm, and 3.5 fingers) 3. Radial (muscles of post. arm/forearm & skin of back arm, forearm, hand. largest sensory) 4. Ulnar (muscles of hand, skin of medial 1/3 of hand, fine movement. 1.5 fingers)

which plexus is this? label the branches

1. Lateral Femoral Cutaneous: skin latearl thigh 2. Femoral: muscles of ant thigh. sensory parts of thigh and medial side leg 3. Oburator: muscles to medial thigh. sensory medial skin of thigh

which plexus is this? label the branches

1. Superior Gluteal 2. Inferior Gluteal (both supply gluteal muscles, motor) 3. Sciatic (A: Common fibular- muscles of anterior and lateral leg and muscles of dorsum on foot. sensory to skin on latearl elg and dorsum of foot B: Tibial- muscles of back of thigh and leg and all muscles of plantar foot skin of back f leg and plantar foot) 4. Pudendal: sensory to skin of genitals. motor pelvic floor