文档介绍：Spinal Cord (sp cd) and Nerves
NERVOUS SYSTEM
Collect sensory input
Integrate sensory input
Motor output
Functions of Nervous System
Organization of Nervous System
Central Nervous System (CNS) = brain and spinal cord
Peripheral Nervous System (PNS) = nerves
CNS
PNS
Peripheral Nervous System
skin
muscle
Spinal Nerves (31 pairs)
Each pair of nerves located in particular segment (cervical, thoracic, lumbar, etc.)
Each nerve pair is numbered for the vertebra sitting above it (. nerves exit below vertebrae)
8 pairs of cervical spinal nerves; *C1-C8
12 pairs of thoracic spinal nerves; T1-T12
5 pairs of lumbar spinal nerves; L1-L5
5 pairs of sacral spinal nerves; S1-S5
1 pair of ygeal spinal nerves; C0
Spinal Cord Segments
Central Nervous System
Brain and Spinal Cord
Occupy Dorsal Cavity
Meninges of Brain and Spinal Cord
Pia mater (deep)
delicate
highly vascular
adheres to brain/sp cd tissue
Arachnoid mater (middle)
impermeable layer = barrier
raised off pia mater by rootlets
Spinal Dura Mater (most superficial)
single dural sheath
Subarachnoid Space
between arachnoid and pia mater
contains CSF
Epidural Space
Between dura mater and vertebra
Contains fat and veins
Spinal Cord (sp cd)
Passes inferiorly through foramen magnum into vertebral canal
31 pairs of spinal nerves branch off spinal cord through intervertebral foramen
Spinal cord made of a core of gray matter surrounded by white matter
Runs from Medulla Oblongata to level of L 1 (adults)
Runs to level of L 3-4 (infants)
Spinal Cord Growth