Anat I - Peripheral Nervous System

12, 31

The peripheral nervous system has:

__ pairs of cranial nerves

__ pairs of spinal nerves

C1-C8

In general, every spinal nerve is named after vertebra under which it emerges from vertebral canal

EXCEPT _____ (hint: spinal nerve count exception)

Visceral, somatic

The afferent sensory division is compromised of the (2) ___ nervous systems

Visceral, sympathetic, parasympathetic, somatic

The efferent motor division is compromised of the (4) ___ nervous systems

Multipolar motor neuron

Efferent neuron type, axon branching

Pseudounipolar sensory neuron

Afferent neuron type, single branch

epi, dermis, superficial, deep, muscles, bones, glands, smooth

Body wall

Mostly somatic - conscious operating

__dermis, __ (skin), __ fascia, __ fascia, __ + __ (MSK)

Somewhat visceral - unconscious, involuntary

__ (endocrine component)

__ muscle

Visceral

The body cavity is all ___ (somatic/visceral)

General Somatic Afferent (GSA)

System that carries sensory information from somatic structure

General Visceral Afferent (GVA)

System that carries sensory information from visceral structure

General Somatic Efferent (GSE)

System that carries motor information to a somatic structure

General Visceral Efferent (GVE)

System that carries motor information to a visceral structure

Vertebral, Late, puberty, shorter, cervical

Spinal cord

• Spinal cord sits inside the __ column

• Spinal cord growth is complete in __ fetal development, however vertebral column continues to lengthen thru __

• Spinal cord is much __ (larger/shorter) than the vertebral column

  • Although same # of segments, exception is +1 __ (spinal region) nerve

8, 12, 5, 5

Cervical* nerves = _

Thoracic nerves = _

Lumbar nerves = _

Sacral nerves = _

Conus medullaris, cauda equina

Spinal nerve roots

A = __ __ around L1-L2

B = __ __

Superior, L1-L2, shorter

Spinal Cord Length

• Superior to inferior look of spinal segments sees more acute angle of spinal nerve exit

• End of spinal cord shifts __ (superior/inferior) in development to __ (spinal vertebrae region)

• Explains why spinal cord is much __ (shorter/larger) than vertebral column

Dura mater, arachnoid mater, pia mater, denticulate

Meninges

A =

B =

C =

D = __ ligaments

Epidural, fat, vessels

The __ space is between dura m and vertebral canal

• containing __ and blood __

Subdural Space

Potential space between dura m and arachnoid m; no contents inside

Subarachnoid, CSF

The __ space is between the pia m and arachnoid m

• containing ___

Subarachnoid, conus medullaris, 3-4, 4-5

To sample CSF or administer anesthesia

• This is done within the __ space

• Inferior to the __ __ (spine anatomical region)

• Between L_ - L_ OR L_ - L_

Dorsal, lateral, ventral

A =

B =

C =

Gray matter

Transmits information laterally to and from spinal nerves

(Grey vs white matter)

White matter

Transmits information up and down spinal cord

(Grey vs white matter)

ventral root, ventral ramus, spinal nerve, dorsal root, dorsal root ganglion, dorsal ramus

A =

B =

C =

D =

E =

F =

Afferent sensory, sensory

The dorsal root only uses __ (efferent/afferent) __ neurons

• DRG are cell bodies of __ neurons

Efferent motor

The ventral root only uses __ (afferent/efferent) __ neurons

afferent, efferent, back, neck, body, larger

Dorsal ramus + ventral ramus

• Uses both __ (sensory) and __ (motor) fibers

• Dorsal R - Primarily innervates the skin and intrinsic muscles of the __ and __

• Ventral R - Innervates rest of the __, is slightly __ (smaller/larger) in size than dorsal ramus

Cervical, neck

__ plexus relates to C1-C5 ; and the __

Brachial, upper

__ plexus relates to C5-T1 ; and the __ limb

Intercostal, thorax

__ plexus relates to T1-T12 ; and the __

Lumbar + sacral, pelvis, perineum, lower

The __+__ plexus relates to L1-S4 ; __, __, and the __ limb