histology - deer park independent school district / · pdf file3 types of muscle •...

Histology

Muscle Tissue And

Nerve Tissue

Histology

Muscle Tissue

Muscle Tissue

• Functions for – Support – Movement (contraction)

– Body heat

3 Types of Muscle

• Skeletal muscle – Body movement – Many nuclei/cell

3 Types of Muscle

• Skeletal muscle – Striated (stripes) – Voluntary (you control)

Skeletal Muscle

Striations

(stripes) Nuclei

Skeletal Muscle

Skeletal Muscle

Skeletal Muscle

3 Types of Muscle

• Smooth muscle – Visceral (organs) – Walls of vessels – Stomach & GI tract

3 Types of Muscle

• Smooth muscle – Long narrow fibers – One nuclei/cell

3 Types of Muscle

• Smooth muscle – Non-striated – Involuntary

Smooth Muscle

Smooth Muscle

Nuclei

Smooth Muscle

Smooth versus Skeletal

Smooth versus Skeletal

Smooth

Smooth Muscle

Intestinal Wall Smooth Muscle

3 Types of Muscle

• Cardiac muscle – Striated – Involuntary – Heart

3 Types of Muscle

• Cardiac muscle – Cross striations – Dark bands called intercalated disks • 2 membranes meet • Passage for message from one cell to next, allows heart to beat

Cardiac Muscle

Intercalated disk

Nuclei

Cross Striations

Cardiac Muscle Bifurcation – Splitting of cell

Cardiac Muscle

Cardiac Muscle Intercalated disks

Cardiac versus Skeletal

Intercalated disks

Histology

Nerve Tissue

Function of Nerves

• Receive stimuli • Interpret • Respond

System Includes:

•Central Nervous System (CNS) – Brain – Spinal cord

• Peripheral Nerves

System Includes:

•Peripheral Nervous System (PNS) – Sensory Nerves – Motor Nerves

Nervous Tissue :

1. Neuron or nerve cell 2. Neuroglia or Glia

cells - supporting cells

Nerve Cell:

• Cell body (soma) – with nucleus

Nerve Cell:

• Cell body (soma) – with nucleus

Cell body

Nerve Cell:

• Dendrites (one or more) - receive

stimulus - stimulus

moves toward soma

Nerve Cell:

Dendrites

Nerve Cell:

• Axons (one) - receive

stimulus - stimulus

travels away from soma

Nerve Cell:

• Axons • protected by

myelin sheath

• Only one

axon per cell

Axon

How does the signal pass from cell to cell?

Neurotransmitters are released at the axon terminal

to travel to the dendrite of the next neuron