Access Millions of academic & study documents

Nervous System Assignment

Content type
User Generated
Subject
Biology
School
Cuyamaca College
Type
Homework
Showing Page:
1/2
Nervous System Assignment
a) You step barefoot on hot sand. Trace sensory message of pain from the receptor of bottom of
your foot to appropriate sensory cortex. Include specific nerves
Free nerve endings (nociceptors)----> Tibial nerve (branch of Sciatic nerve)--------> spinal
nerves L4-S3 -----> Lumbosacral plexus ----> dorsal ramus------->Dorsal root ganglion----
>Doral Root------>Dorsal Horn (synapse) -----> Thalamus (synapse)-----> Internal Capsule---->
Primary somatosensory cortex, postcentral gyrus of Cerebrum
*The tibial nerve provides sensation to the soles of the foot and toes. It is a branch of the sciatic
nerve. The sciatic nerve itself is derived from the L4-S3 spinal nerves which in turn are part of
the lumbosacral plexus.
b) Your friend is massaging your back with deep pressure. Trace the sensory message of pressure
from the receptor on your back to the appropriate sensory cortex
Lamellated Pacinian corpuscles (deep pressure receptors)----> thoracic (upper back) and lumbar
(lower back) spinal nerves > Lumbar plexus (lower back) ----> dorsal ramus------->Dorsal root
ganglion---->Doral Root------>Dorsal Horn (synapse) -----> Thalamus (synapse)-----> Internal
Capsule----> Primary somatosensory cortex, postcentral gyrus of Cerebrum
*Thoracic spinal nerves have no plexus
c) While hanging a picture on the wall the hammer slips and you hit your thumb. You experience
a great deal of pain
Trace the sensory pathway from appropriate receptor to the brain
This answer is based on the situation in which it is probably the dorsal part of the thumb which is
hit since the palmar side of the thumb has different innervation.
Free nerve endings (nociceptors)----> Superficial branch of radial nerve-----> C7 spinal nerve--
Brachial plexus---> ----> dorsal ramus----->Dorsal root ganglion----Doral Root------Dorsal
Horn (synapse) -----> Thalamus (synapse)-----> Internal Capsule----> Primary somatosensory
cortex, postcentral gyrus of Cerebrum
Trace the motor pathway from brain to wrist extensors to move thumb away from the hammer
Motor Cortex Of Cerebrum----> Internal Capsule----> Mesencephalon----> Pons----> Medulla---
-->Anterior Horn (Synapse)----> Anterior Root -----> Exit Ventral Ramus---->Brachial Plexus---
-> C5-C8 Spinal Nerves----> Radial nerve-----> Extensor Carpi Radialis Longus And Brevis
Muscles (Synapse)
*wrist extensor muscles : Extensor carpi radialis longus, extensor carpi radialis brevis

Sign up to view the full document!

lock_open Sign Up
Showing Page:
2/2

Sign up to view the full document!

lock_open Sign Up
Unformatted Attachment Preview
Nervous System Assignment a) You step barefoot on hot sand. Trace sensory message of pain from the receptor of bottom of your foot to appropriate sensory cortex. Include specific nerves Free nerve endings (nociceptors)----> Tibial nerve (branch of Sciatic nerve)--------> spinal nerves L4-S3 -----> Lumbosacral plexus ----> dorsal ramus------->Dorsal root ganglion--->Doral Root------>Dorsal Horn (synapse) -----> Thalamus (synapse)-----> Internal Capsule----> Primary somatosensory cortex, postcentral gyrus of Cerebrum *The tibial nerve provides sensation to the soles of the foot and toes. It is a ...
Purchase document to see full attachment
User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.
Studypool
4.7
Indeed
4.5
Sitejabber
4.4

Similar Documents