TOPICS 4-6 Flashcards
Name all Cranial nerves (from Anterior to posterior)
C1- Olfactory C2- Optic C3-Oculomotor C4- Trochlear C5-Trigeminal C6-Abducens C7- Facial C8- Vestibulocochlear C9- Glossopharyngeal C10- Vagus C11- Accessory C12- Hypoglossal
Sensory types Cranial Nerves
C1- Olfactory
C2- Optic
Motor types
C3- Oculomotor C4- Trochlear C6- Abducens C11- Accessory C12-Hypoglossal
Mixed types (Cranial nerves)
C5- Trigeminal
C7- Facial
Basic Function of Smell
C1- Olfactory
Basic function of Smell
C2- Optic
Basic function of C3- Oculomotor
Motor (somatic): eye muscles (levator palpebrae superioris, medial, superior, inferior rectus, inferior oblique)
Motor (somatic): eye muscles (levator palpebrae superioris, medial, superior, inferior rectus, inferior oblique) what is this correlated with?
C3- Oculommotor
What are the functions of C4- Trochlear
Eye muscles (superior oblique); pulls eyeball inferiorly and laterally
Eye muscles (superior oblique); pulls eyeball inferiorly and laterally is correlated with what?
C4- Trochlear
What are the basic functions of C5?
Motor: Muscles of mastication (chewing) ex. Masseter and temporalis
Sensory: Skin of face/ scalp
Motor: Muscles of mastication (chewing) ex. Masseter and temporalis
Sensory: Skin of face/ scalp.. correlation
C5- Trigeminal (3 branches)
basic functions of C6
Eye muscle (lateral rectus); abducts eyeball
Eye muscle (lateral rectus); abducts eyeball is correlated with
C6- Abducens
Basic functions of C7
Motor (somatic): muscles of facial expression- eg: buccinator, platysma, orbicularis oris and oculi, frontalis
Motor (somatic): muscles of facial expression- eg: buccinator, platysma, orbicularis oris and oculi, frontalis
C7- Facial
What are the functions of C11
Sternocleidomastoid and Trapezius Muscles
Sternocleidomastoid and Trapezius Muscles
C11- Accessory
What are the functions of C12-
Muscles of tounge
Muscles of tounge
C12- Hypoglossal
test for visual acuity
C2- Optic
by having a person identify the number of fingers held up in each visual field
test for smell
C1- Olfactory
Have person identify familiar odors applied to each nostril (vanilla, peppermint, coffee)
Cranial nerves associated with eye movement testing
C3-Oculomotor
C4-Trochlear
C6- Abducens
(H-pattern movement)
What movements will be affected if someone has damaged CN 111?
can impair ocular motility, pupillary function, or both
What movements will be affected if someone has damaged CN 4
it may not be able to do its job. Controlling the movement of the superior oblique muscle
what movements will be affected if someone has damaged CN 6
The abduction of the eyeball, Eye muscle lateral rectus
Facial sensation test
C5- Trigeminal
“chewing muscle strength”
“Facial expression” muscle strength
C7- Facial
Traps, SCM movement tested
C11- Accessory
Tounge movement tested
C12- Hypoglossal
How many Spinal nerves are there?
31 total 8 cervical 12 thoracic 5 lumbar 5 sacral 1 coccygeal
How does each nerve exit?
Vetebral canal via the intervetebral foramen
Nerve plexus
Rather than directly supplying the body structures upon exiting the spinal cord (mainly the limbs): the anterior rami form cervical plexus by joining the anterior rami and the adjacent nerves
except T2-T12
Plexuses allow for a merging of the axons that were contained within each of the spinal nerves
Nerve plexuses
Nerves between C1-C4 (AND A PORTION OF C5) is called?
Cervical plexus
What is the only nerve we should remember in the cervical plexus and what does it do?
The phrenic nerve (C3,C4 AND C5 keep them alive) which innervates the diaphragm muscle
Brachial Plexus
nerves arise between C5-T1 ->supplying by innervating-> the entire arm and some neck and shoulder muscles
Brachial plexus process
From proximal to distal, The nerve roots (C5-T1) merge and divide together to eventually give rise to the peripheral nerve branches that innervate various structures in the upper and lower limbs. (Roots->Trunks->divisions->cords>branches)
- (C5-T1) ROOTS merge into 3 TRUNKS (C5&6-> UPPER, C7->MIDDLE, C8,T1-> LOWER)
- Trunks split into Divisions (Anterior & Posterior)
- The posterior divisions of all trunks form the posterior cord, the anterior divisions of all trunks form the Lateral and Medial cords
- The cords then give rise to various peripheral nerve branches
Lumbar plexus
L1-L4
Sacral Plexus
nerves arising from L4-L5 and S1-S4
Some of the nerves of the sacral plexus contain fibers from the lumbar plexus, this is known as the lumbosacral plexus
How do peripheral nerve branches work?
- Nerve exits from the plexus as “nerve branches”- each containing sensory axons, motor axons and both
- Each nerve has a “spinal component/nerve root” which indicates which spinal nerves contributed to its formation
Each nerve will provide either both:
Sensory axons: skin, muscle, joint and connective tissue components
Motor axons: muscle
both
Cutaneous innervation is…
Refers to the area of skin innervated by a specific peripheral nerve branch
Interdome refers…
an area of skin innervated by the cutaneous branch of a single spinal nerve
Motor Branches of the Brachial plexus
Dorsal Scapular= C5 Long thoracic=C5-C7 Suprascapular=C5-C6 Thoracodorsal=C6-C8 Axillary=C5-C6 Musculocutaneous=C5-C7 Radial= C5-C8, T1 Ulnar= C8, T1 Median=C5-T1
Motor branches of the lumbar plexus
Femoral->L2-L4 ->
Obturator->L2-L4->
Motor Branches of the sacral plexus
Sciatic-> L4-S3 Tibial (medial and lateral plantar)-> L4-S3 Common fibular (peroneal)-> L4-S2 Superficial->L4-S2 Deep->L4-S2
Cutaneous innervation of the limbs
Supraclavicular-> neck and superior shoulder
Axillary-> Lateral shoulder
Musculocutaneous-> Lateral elbow and forearm
Radial-> Posterior arm/forearm; Lateral 2/3 of dorsal hand and 3.5 digits up to DIPS
Median-> Lateral 2/3 Volar hand and 3.5 fingers
Ulnar->Medial 1/3 hand including the entirety of D5 and medial 1/2 of D4
Lateral femoral cutaneous nerve of thigh-> Lateral Thigh
obturator-> medial thigh
Saphenous-> Anteromedial, medial and posteromedial of leg and foot
Sural-> Posterolateral leg and foot
Common Fibular (Peroneal)-> Proximal anterolateral leg
Superficial Fibular (Peroneal)-> Distal anterolateral leg and dorsum of foot
Tibial (Medial and Lateral Plantar)-> Plantar foot
Bones of the skull
- Cranium (braincase)
- Calvaria (skull cap)
- Base of the skull
- Anterior, middle, posterior cranial fossa
- Parietal Bones
- Temporal bones
- Frontal bones
- Occipital Bone
- Sphenoid bone
- Ethmoid Bone