Nervous System II - Lecture#2(Nervous System II I General function A Acquireing information=sensory input Afferent neurons(approaching PNS B

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture #2 (Nervous System II) 17:39 I. General function A. Acquireing information=sensory input Afferent neurons (approaching) PNS B. Processing Information= integration Interneurons CNS C. Sending out commands (responding)= motor output (thoughts) Efferent neurons (exciting) PNS D. 2 main branches  of the vertebrate nervous system 1. Central Nervous system (CNS) i. Brain and spinal cord 2. Peripheral Nervous system (PNS) i. Everything else (figure 4)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
II. Organization A. Cniderians Nerve net (radially symmetrical) No CNS Neurons not specialized Signal transmission can be unpolarized(multidirectional) o Ex. You can touch one tenticle and another part of the body will recognize the impulse. B. Cephalization (bilaterally symmetrical animals)= concentration of integrating parts of the nervous system  at the anterior end (head) of the animal  brain or integrating center signal transduction is polarized (unidirectional) 1. Ganglionic nervous system -ganglion=collection of cell bodies (and dendrites), interconnected for integration (~for vertebrates  only in PNS) -in ganglionic nervous systems, CNS comprised entirely of ganglia and connectives - connectives= bodies of axons that carry signals beween ganglia 2. Columnar nervous sytem (vertebrates) CNS= brain and spinal cord Brain= complex integrating center, made up of nuclei and tracts Nucleus= collection of cell bodies and dendrites in the brain
Background image of page 2
Tract= grouping of axons Spinal cord= column of ganglia and axons III. Reflexes= rapid integration, (usually) to prevent bodily injury
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/23/2008 for the course BIO 131 taught by Professor Mostman during the Spring '08 term at University of California, Santa Cruz.

Page1 / 12

Nervous System II - Lecture#2(Nervous System II I General function A Acquireing information=sensory input Afferent neurons(approaching PNS B

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online