A&P I Chp. 16 - Somatic Sensory Pathways
somatic sensory
-------- ----- pathways relay information from receptors to the primary somatosensory area in the cerebral cortex and the cerebellum
fasciculus gracilis, fasciculus cuneatus
2 divisions of posterior (dorsal) column
posterior (dorsal) column
A somatic sensory pathway that's for fine touch, pressure, vibration, & proprioception
anterolateral spinothalamic tract
A somatic sensory pathway that's for pain, temperature, itch, and tickle
second order neurons
Axons of ________ _______ ______decussate in the brain stem or spinal cord
fine touch, pressure, vibration , stereognosis, proprioception
Posterior (dorsal) column is for ---- -----, ------, ------, -------, --------
spinal cord, brainstem, thalamus
Second-order neurons conduct nerve impulses from the -------- or -------- to the --------
first order neurons
Sensory neurons that conduct impulses from the PNS to the CNS are called ------- ------- --------
cranial
Somatic sensory impulses from the face, mouth, teeth, and eyes travel along the ----- nerves into the brain stem
spinal
Somatic sensory impulses from the neck, trunk, limbs, and posterior aspect of the head travel along the ------- nerves into the spinal cord.
fasciculus cuneatus
The _________ _________ transmits nerve impulses for touch, pressure, vibration, and conscious proprioception from the upper limbs and trunk, neck, and posterior head.
spinocerebellar
The ___________ tracts are the major routes proprioceptive impulses take to reach the cerebellum.
cerebellum
The anterior and posterior spinocerebellar tracts transmit proprioceptor impulses to the --------
third order neurons
The cell bodies of ________ ________ ________ are located in the thalamus.
thalamus
The major relay station in the brain for many sensory pathways is the ------
thalamus
Third-order neurons conduct impulses from the ------- to the primary somatosensory area of the cortex.
A (spinocerebellar)
Which of the following tracts transmit impulses from the trunk and lower limbs on one side of the body to the same side in the CNS? A spinocerebellar B posterior column-medial lemniscus C spinothalamic D trigeminothalamic
spinocerebellar tracts
a somatic sensory pathway that's critical for posture, balance, and coordination of skilled movements
thalamus
anteriolateral spinothalamic tract and posterior (dorsal) column extends to the ---------
pain, itch, temperature, tickle
anterolateral spinothalamic pathway is involved with ------, -----, -------, and ------ sensations
decussate
axons of second order neurons -------- in the brain stem or spinal cord
three
generalized somatic sensory pathways contains ----- neurons
fasciculus gracilis
nerve impulses for touch, pressure, and vibration from the lower limbs propagatete along the axons in the ---------, a division of posterior (dorsal) column
fasciculus cuneatus
nerve impulses for touch, pressure, and vibration from the upper limbs propate along axons in the ----- ----, a division of posterior (dorsal) column
first order
neurons that conduct impulses from somatic receptors into the brain stem or spinal cord
second order
neurons that conduct impulses from the brain stem and spinal cord to the thalamus
third order
neurons that conduct impulses from the thalamus to the primary somatosensory area of the cortex on the same side
spinocerebellar
somatic sensory impulses reach the cerebellum via the ------- tracts
somatic sensory, 2, ipsilateral
spinocerebellar tracts is a ------- ------ pathway that involves only ----- neurons, and is -----------
parietal, postcentral, primary somatosensory
the anterolateral spinothalamic tract and posterior tract's 3rd order neuron terminates in the ------ lobe = ------- gyrus = ------ ------- area
stereognosis
the mental perception of depth or three-dimensionality by the senses, usually in reference to the ability to perceive the form of solid objects by touch
