Peripheral Nervous System Flashcards
A bundle of neuron fibers found outside the CNS
Nerve
Nerve Structures:
I. Endoneurium
II. Perineurium
III. Epineurium
Carries sensations
Afferent (Sensory) Nerves
Carries motor fibers
Efferent (Motor) Nerves
both sensation & motor fibers
Mixed Nerves
Note:
All spinal nerves are MIXED
Oh, Oh, Oh, To Touch And Feel A
Girl’s Vagina Ah, Heaven!
Cranial Nerves
Cranial nerves
I. Olfactory Nerve
II. Optic Nerve
III. Oculomotor Nerve
IV. Trochlear Nerve
V. Trigeminal Nerve
VI. Abducens Nerve
VII. Facial Nerve
VIII. Acoustic Nerve
IX. Glossopharyngeal Nerve
X. Vagus Nerve
XI. Accessory Nerve
XII. Hypoglossal Nerve
Sense of smell
Olfactory Nerve
Vision
Optic Nerve
Function:
a. Nerve supply for the muscles that direct the
eyeball.
• CN4: Superior Oblique
• CN6: Lateral Rectus
• CN3: Superior & Inferior Recti; Inferior Oblique
b. Controls cardinal g
Cranial Nerve 3, 4, 6
Largest cranial nerve because of it’s sensory
distribution
Function:
Motor: Muscles of mastication
Sensory: Facial Sensation
• Opthalmic Division
• Maxillary Division
• Mandibular Division
Trigeminal Nerve
• Function:
• Motor: Facial Expressions
• Sensory: Taste for the anterior 2/3 of the
tongue
• Autonomic: Salivation & Lacrima formation
Facial Nerve
Balance & Hearing
Acoustic Nerve
Function
• Motor: Stylopharyngeus Muscle
• Sensory: Taste & general sensation to
posterior 1/3 of the tongue
• Autonomic: Parotid gland; monitors carotid
body & sinus
Glossopharyngeal Nerve
Function
• Motor: Muscles of the pharynx & larynx
• Sensory: Skin to the pinna of the external ear & sensation to pharynx, larynx & epiglottis
• Autonomic: Innervates visceral organs of the thorax & abdomen
Vagus Nerve
Function
• 2 parts
• Cranial: supplies pharyngeal muscles
• Spinal: Supplies SCM & Trapezius
Accessory Nerve
Function: Supplies tongue muscles
Hypoglossal Nerve
• Muscle: Deltoid
• Skin: shoulder & superior thorax
Axillary
• Muscle: Triceps & Wrist extensors
• Skin: Posterior upper limb
Radial
• Muscle: Wrist flexors; Some hand intrinsics
• Skin: forearm
Median
• Muscle: Arm flexors
• Skin: Lateral forearm
Musculocutaneous
• Muscle: Some wrist flexors & most of hand
intrinsics
• Skin: hand
Ulnar
• Muscle: Hip flexors & Knee extensors
• Skin: anteromedial leg & thigh
Femoral
• Muscle: Adductors
• Skin: Medial thigh
Obturator
• Largest nerve in the body
• Muscle: hip extensors & knee flexors
• Skin: Lower trunk & posterior th
Sciatic Nerve
• Muscle: Peroneals
• Skin: lateral leg & foot
Common Fibular Nerve (Superficial & Deep)
• Muscle: Calf muscles
• Skin: Posterior leg & foot
Tibial Nerve
Innervate gluteal muscles of the hip
Superior & Inferior Gluteal Nerve
motor subdivision of PNS that controls body activities automatically
Autonomic Nervous System
• Thoracolumbar division
• T1-L3
• aka Fight or Flight Response; Emergency Response;
Stress Response; Excitemetn; Exercise; Adrenergic
Response
• Predominant Neurotransmitters
• Epinephrine
• Norepinephrine
Sympathetic nervous system
• Craniosacral Division
• Cranial Nerves: 10, 9, 7, 3
• Sacral Nerves: S2, S3, S4 (urinary bladder)
• aka Rest & Digest; Cholinergic Response
• Predominant Neurotransmitter
• Acetylcholine
Parasympathetic nervous system
3 Major Area of the Ear:
- External Ear
- Middle Ear
- Internal Ear
The Eye: Muscles
- Superior Oblique
- Inferior Oblique
- Superior Rectus
- Inferior Rectus
- Lateral Rectus
- Medial Rectus
Auricle & External Acoustic Meatus
External Ear
• small, air-filled, mucosa-lined cavity in the
temporal bone
• (+) Ossicles
• Malleus, Anvil, Stapes
Middle ear
• Bony labyrinth
• 3 subdivisions: cochlea,vestibule & semicircular canals
Internal ear
▪ (+) Maculae
▪ Reports changes in the position of the head in space wth respect to the pull of gravity when body is moving.
Static
▪ (+) Dynamic Equilibrium Receptors
▪ respond to angular or rotational movements of the head rather than to straightline movements.
Dynamic
