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