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Ross Chezem
12/16/10
1A
AP Bio
Neuron Pathway Story
Travis Hammenheimer will have to travel along the nerve in the finger which will
lead to the median nerve. If he keeps going along the median nerve he will eventually
reach the brachial plexus which is located in the shoulder area of the body. If Travis
keeps traveling up the brachial plexus he will eventually reach the spinal cord which will
lead in to the brainstem. From the brainstem he would reach the cerebellum and from the
cerebellum he would reach the occipital lobe. After crossing the occipital lobe he would
reach the parietal lobe. From the parietal lobe he would enter the frontal lobe and move
down to the bottom of the frontal lobe to reach the cerebral cortex. This may sound very
simple but along the way Travis will run into and encounter several different cells and
structures varying in shape, size, and form.
The first structure Travis will encounter as he travels along the nerves in the index
finger to the median nerve is the lumbrical muscles, which flex proximal phalanges and
extend the middle and distal phalanges. After he passes the lumbrical muscles he will
reach a junction where several nerves from the fingers are merging in to on nerve that
weaves in and out of the thenar muscles towards the bottom of the palm. Next he will
run into the palmar branch of the median nerve, which is located on the underside of the
wrist. As he travels along the beginning of the median nerve he will travel in between the
flexor digitorum profundus muscle and the flexor digitorum superficialis muscle. While
he is traveling between those two muscles he will pass by the joint between the radius
and the humerus in the elbow area. Eventually he will reach the lateral cord of the
brachial plexus. While he is traveling along the beginning of the brachial plexus he will
travel under part of the collar bone. As Travis continues he will pass two small nerves:
lateral pectoral and suprascapular. After he passes these two nerves he will reach the
trunk of the lateral cord of the brachial plexus. In a short bit after the trunk he will reach
the root of the lateral cord of the brachial plexus. While traveling through the root he will
travel past the dorsal scapular. Travis will eventually into the C5 nerve of the spinal
cord. From the C5 nerve he will end up along the spinal cord, while he is traveling up the
spinal cord he will pass the C4, C3, C2, and C1 nerves, which all lead to lungs and the C2
nerve is head and neck movement as well. From the spinal cord he will travel into the
brainstem, which controls your breathing and heart beat. Once he reaches where the
brainstem and cerebellum meet he will go around the cerebellum, but he may want to
watch out for wrinkles in the brain because he could fall in to the wrinkle with his current
size. After he goes around the cerebellum he will reach the occipital lobe which will be
cover in cerebrospinal fluid. As he gets half way across the occipital lobe the
cerebrospinal fluid will be covered by meninges or brain lining. At the end of the
occipital lobe he will reach the parietal lobe which will also be covered in cerebrospinal
fluid cover with meninges. After he gets across the parietal lobe he will reach the frontal
lobe, which is also covered with cerebrospinal fluid covered with meninges. Once Travis
has reached the bottom of the frontal lobe he will have reached the cerebral cortex.
When he has reached the cerebral cortex of Sparky Gugglensky, the cerebral cortex will
identify him and zap him outside of Gugglensky’s body and change him back to normal.