LABORATORY SEVEN

The Neuroendocrine System: Overview

The Neuroendocrine System(homeostasis control)

• Nervous system (rapid & transient)

• Central• Peripheral

– Somatic: voluntary– Autonomic: involuntary

• Endocrine system (slow & long lasting)

The Endocrine System

Fig 7.2, p119 – only model

Islets of Langerhans

Microscopic view of a group of cells in the pancreas that are endocrine in function

The Peripheral Nervous System

• Cranial Nerves - 12 pairs– Sensory (afferent) - carry impulses toward the CNS– Motor (efferent) - carry impulses away from the CNS– Mixed (both sensory & motor in a nerve bundle)– Located inferiorly, numbered in order, anterior to

posterior

• Spinal Nerves - 31 pairs– Mixed– Numbered based on the name and number of their

associated vertebrae

Cranial Nerves

Auditory

Spinal

(When studying the Cranial Nerves model, turn the

page 180o)

Memory Tool for Learning Cranial Nerves

Nerve Name FunctionOlfactory nerve I On Some (sensory)Optic nerve II Old Say (sensory)Oculomotor nerve III Olympus’ Marry (motor)Trochlear nerve IV Towering Money (motor)Trigeminal nerve V Top But (both S & M)Abducens nerve VI A My (motor)Facial nerve VII Finn Brother (both)Auditory nerve VIII And Says (sensory)Glossopharygeal nerve IX German Big (both)Vagus nerve X Viewed Brains (both)Spinal Accessory nerve XI Some Matter (motor)Hypoglossal nerve XII Hops More (motor)

Spinal Nerves(both sensory and motor

in function)

• Cervical (C1-C8)• Thoracic (T1-T12)• Lumbar (L1-L5) • Sacral (S1-S5)• Coccygeal (Co)

Plexuses

Collection of nerves that innervates a specific region of the body:

• Cervical: head & neck, diaphragm

• Brachial: upper limb• Lumbar: anterior thigh• Sacral: buttocks, lower

limb, and pelvis

The Autonomic Nervous System

• Sympathetic: fight-or-flight– Increases the heart rate, blood

pressure, breathing rate, sweat gland activity

• Parasympathetic: rest-and-repose– Lowers the heart rate and blood

pressure

Biopac Setup for Lie Detection(7A Procedure, p118)

• To test the function of autonomic nervous system • Measure sympathetic response and subsequent

release of adrenal gland hormones– Galvanic skin response will be analyzed only

• measures an increase in electrical conductivity of skin following excess sweat and ions contained therein

• Class should be quiet!• Write down your answers in your laboratory

report, Tables 7.1-7.3, p124 & 125

Lab Report 7

• Fig 7.1, p123– Sympathetic and parasympathetic nervous

system control the same organs with opposite effects

– Go to your text book and look where the nerves are coming off of the CNS, not the tissue they stimulate

• Let’s answer Q79-82, p126, in the class.