Part of neurons, spinal cord and associated structures

Dendrite

Receive signals from other neurons or special sensory cells

Soma/cell body

Where the nucleus is

Axon

Light gray. Sends signals between brain cells

Axolemma

Controls ion flow to generate electrical signals. axon potential reaches threshold

Neurolemmocyte

Forms myelin sheath (the cell)

Neurofibril node/ node of ranvier

Where action potential happen

Endoneurium- connective tissue

Bind neighboring axons to one another

Telodendrion

helps send messages from one nerve cell to another by releasing chemicals at the end of a neuron

Synaptic knob

the rounded end of a neuron where neurotransmitters are released to send signals to the next cell

Conus medullaris

L1 vertebra, end of spinal cord

Cauda equina

Nerves runs through the vertebral canal inferior to the conus madullaris. sends nerve signals to and from the legs, feet, and pelvic organs

Cervical enlargement

motor & sensory neurons serving(providing to) the upper limbs

Lumbosacral enlargement

Motor and sensory nerves serving(provided to) lower limbs

Posterior sulcus

Shallow groove divides

Anterior median fissure

Dissection of the vertebral canal with the spinal cord & spinal nerves exposed/ division

Anterior ramus

a branch of a spinal nerve that carries signals to and from the front and sides of the body, including the limbs

Cervical plexus

a network of nerves in the neck that sends signals to the head, neck, shoulders, and diaphragm

Phrenic nerve

takes motor signals to the diaphragm

Brachial plexus

etwork of nerves that sends signals to the shoulders, arms, and hands

Lumbosacral plexus

a group of nerves that sends signals to the lower back, pelvis, legs, and feet

Obturator nerve

Takes motor and sensory signals to/from the medial thigh

Sciatic nerve

Takes motor signals to the hamstring muscle and carries sensory info from much of the posterior thigh and leg as well as the plantar foot

Central canal

Cavity with CSF

Anterior horn

Contains bodies of somatic motor neurons. the axons of there motor neurons travel to skeletal muscles

Posterior horn

Axons from sensory neurons bringing info from the body regarding touch and proprioception

Lateral horn

part of the spinal cord that contains nerve cells involved in controlling involuntary functions like heart rate and digestion

Gray commissure

Connects sides

Posterior funiculus

White matter, a group of myelinated axons conveying info from the brain regarding touch, perception, ect

Anterior funiculus

myelinated axons involved in taking sensory signals to the thalamus as well as motor commands involved in balance and coordination

Lateral funiculus

myelinated axons involved in taking sensory signals to the cerebellum and thalamus as well as motor command from the cortex and brain stem

Ventral root

Contains axons if ventral horn motor neurons that will travel to skeletal muscles

Dorsal root ganglion

Soma of sensory root, brings sensory info into the spinal cord

Dorsal root

contains sensory axons bringing sensory info into dorsal horn

Spinal nerve

Sensory axons of the dorsal root and motor axons of the ventral root, mixed nerve