Functions: The spinal cord per-forms two general functions. Briefly, it provides conduction routes to and from the brain and serves as the integrator, or reflex center, for all spinal reflexes (2)

Dura mater: made of strong white fi-brous tissue, serves as the outer layer of the meninges and also as the inner pe-riosteum of the cranial bones.

Arachnoid membrane, a delicate, coweb like-layer, lies between the dura matter and the pia matter or innermost layer of the meninges

Pia matter: innermost layor of the men-inges. The transparent pia matter ad-heres to the outer surface of the brain and spinal cord and contains blood ves-sels

Cerebrospinal fluid: In addition to its bony and membranous coverings, nature has further protected the brain and spinal cord against injury by providing a cushion of fluid both around the organs and within them, it also a reservoir of circulating fluid that, along with blood, the brain

monitors for changes in internal environment.

Where is it found : cerebrospinal fluid is found in the subarachnoid space around the brain and spi-nal cord within the cavities and canals of the brain and spinal cord. Which are called ventricles

Spinal cord: the spinal cord lies in the spinal cavity, extending from the foramen magnum to the lower border of the first lumbar vertebra, a distance of about 45 cm in the average body. The spinal cord does not completely fill the spinal cavity.

Volume 1, Issue 2 10.29.12

ANATOMY & PHYSIOLOGY WEEKLY

Inside this Issue

Argon’s Part CNS 1,2,3 Page 1

Ashley B’s Part PNS 5,6,7,8 Page 2

Jasmine’s Part CNS 4,5,6 Page 3

Colton’s Part PNS 1,2,3,4 Page 5

Kamiera’s Part CNS 7,8,9 Page 4

Written by– Agron

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Inside the peripheral nervous system there are two subdivisions, the so-matic nervous system and the autonomic nerv-ous system. The auto-nomic nervous system includes fibers that con-nect the CNS to viscera, such as the heart, stom-ach and glands. Within the automatic nervous system it is divided into another two parts the sympathetic nervous sys-tem and the parasympa-thic nervous system. The

autonomic nervous sys-tem functions independ-ently and without con-scious effort. Afferent nerves are the sensory nerves that travel away from the central nervous system and efferent nerves are the motor nerves that travel toward the central nervous sys-tem. As a whole the Auto-nomic Nervous System sends impulses from the central nervous system to smooth muscle, cardiac muscle, and glands. The

purpose of the sympathetic nervous system is to prepare the body for physical activity. The purpose of the parasympathic nervous system is to active vegetative functions such as digestion, defecation, and urination. (1)

Written By—Ashley B.

“The

autonomic

function

functions

independe

ntly”

Page 2 ANATOMY & PHYSIOLOGY WEEKLY

Autonomic Nervous System

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Efferent nerves travel toward the CNS

Afferent nerves travel away from the CNS

Written by-Jasmine

“To catch

the reader's

attention,

place an

interesting

sentence or

quote from

the story

Page 3VOLUME 1, ISSUE 2

© (12)

Written by– Kamiera

Page 4VOLUME 1, ISSUE 2

Page 4

Written by– Colton