Spinal Tracts
The dorsal Column functions
Housed here are cell bodies of sensory neurons bringing info from periphery.
The path is CNS to skeletal muscles (voluntary)
What is somatic motor - LMN
Pre-synaptic cell bodies housed here
Lateral horn of T1-L2
This nerve carries sensory info out of the brainstem into the post- ganglionic neurons
This tract functions with unconscious proprioception and originates in the cerebellum and goes to the spine
What is the spinocererebellum tract
Efferent input
What is ventral root
Cell body of the first neuron located in the grey matter of the CNS
What is the preganglionic neuron (pre-synaptic)
Neurons take one of two paths when leaving the lateral horn. Up to T1-T4-5 to supply the head, UE, upper thoracic; or down to the lower body via this structure
What is the sympathetic trunk
Leaving the spinal cord via the ventral root, the pre-ganglionic neuron joins the spinal nerve and becomes what nerve
WHat is the splanchnic nerve
What is spinothalmic tract
Lateral horn
Communication center that routes the presympathetic neurons to one of 4 paths
What is the sympathetic trunk
This structure has one neuron with direct sympathetic efferent innervation
Adrenal gland- part of the fight or flight mechanism and secretes hormones and neurotransmitters into the blood
Level of pre-synaptic neurons in the lateral horn of spinal cord
What is S2-4
Function of the lateral corticospinal Tract
What is the ability to isolate particular joint movement, create fine motor control occuring in hand, arm, lower leg and foot. Driven by UMN and synapse on LMN in spinal cord
Contains motor (efferent) fibers to take to effector organs peripherally
What is the ventral horn
Stimulates smooth (involuntary) muscless in the blood vessel walls, organs, glands and cardiac muscle
What is visceral motor
3 functions of the Synpathetic NS
what are dilate bronchi, increase HR and BP, and push blood to active muscles
Different from the sympathetic NS where the post- ganglionic neurons were in the sympathetic trunk, parasympathetic post ganglionic neurons originates where
Where is embedded in organs or right next to them
This tract is the one to connec the cerebral cortex to the SC. Control posture and gross motor movements on both sides.
What is medial corticospinal tract
Contains Sensory (afferent) fibers that convey impulse to the CNS from the sensory receptors in various parts of the body
What is the Dorsal horn
Path is body to the CNS
What is somatic sensory
Location of postsynaptic ( post ganglionic) neuron
Near spine or towards organs
3 functions of Parasympathetic NS
What is impact the eye, vontrol energy/storage, slow down HR, RR