Torso: spinal cord

conus medullaris

end of spinal cord, cone shaped

conus medullaris

thin, conical spinal cord below lumbar enlargment

Cauda equina

nerve roots extending below conus medullaris

Filum terminale

thin thread of fibrous tissue at end of conus medullaris

Anterior root

all signals leaving the spinal cord leave through this root

Anterior root

motor

Posterior root

all signals going to the spinal cord go through this root

Posterior root

sensory

Posterior root or dorsal root ganglia

Where are the nerve cell bodies of the sensory neruons of the skin located?

Ganglia

a swelling of a nerve that contain nerce cell bodies

Spinal nerve

Where the and anterior and posterior roots meet

Spinal nerve

exits through the intervertebral foramen

Central Canal

filled with cerebral spinal fluid

posterior median sulcus

Groove on the posterior side of the spinal cord

Anterior median fissure

deeper groove on anterior side of spinal cord

Gray matter

deep in the spinal cord "butterfly"

grey commissure

body of the butterfly

grey commissure

surrounds the central canal of the spinal cord

grey commissure

allows for contralateral communication

horns

wings of butterfly

posterior dorsal gray horns

contain somatic and visceral sensory nuclei

anterior ventral gray horns

contain somatic motor nuclei

lateral gray horns

contain visceral motor nuclei, are in thoracic and lumbar segments

Nuclei

functional grouping of matter

sensory nuclei

visceral and somatic

Doral posterior horn

receive and relay signals from sensory neurons from peripheral receptors

motor nuclei

What is the somatic motor and visceral motor a part of?

Somatic motor

ventral anterior horn that innervates skeletal muscle

Visceral motor

lateral horn that connects to peripheral effectors and skeletal, smooth muscle and glands

white matter

superficial, contains myelinated and unmyelinated axons

posterior white columns

lie between posterior gray horns and posterior median sulcus

anterior white columns

between anterior gray horns and anterior median fissure

lateral white columns

located on each side of spinal cord between anterior and posterior columns

fasciculus gracilis

closest to the median sulcus, transmits touch, pressure sensations from lower body to cerebrum

Fasciculus cuneatus

(lateral to the fasciculus gracilis) transmits touch and pressure sensations from the UPPER BODY to the cerebrum

spinothalmic tract

trasmits pain, temperature impulses to the thalamus

spinocerebellar tract

trasmits proprioception sensations (the sense of the relative position of parts of the body) to the cerebellum