Histology Lab 3

Scott.lehbauer@lethbridgecollege.ab.ca

Muscle Tissues

Muscle Tissue Facts• Well vascularized• Highly cellular tissues• Responsible for most types of body

movement• Posses myofilaments which cause movement

or contraction in all cell types

Skeletal Muscle

Structure – • Elongated cells• Cells are multi-nucleated• Nuclei are located on

the periphery • Obvious striations

throughout.

Nuclei

Skeletal Muscle

Skeletal Muscle

Location – • Attached to the skeleton

• Occasionally attached to the skin

Skeletal Muscle

Skeletal Muscle

Function – • Voluntary movement• Warm blood as the

muscles produce heat. • Locomotion• Facial Expression

Skeletal Muscle

Smooth Muscle

Structure – • Elliptically shaped cells

with a centrally located nucleus

• There are no striations present.

• Cells are close together to form sheets.

Smooth Muscle

Location – • Digestive tract• Walls of the Uterus• Blood vessel walls

Smooth MuscleFunction – • Involuntarily controlled • Produces involuntary

contractions through the linings of the digestive tract and ureters. This movement is called peristalsis.

• Produces involuntary contraction and expansion of the blood vessels (vasodilation / vasoconstriction)

Cardiac Muscle

Structure – • Centrally located nucleus• Striated• Has branching of muscle

cells with intercalated discs• Involuntary control, control

is actually inherent so no external stimuli is required to cause contraction

Cardiac Muscle

Location – • In the heart

Intercalated Disc

Cardiac Muscle

Function – • To contract continuously

from inherent impulse.• Involuntary contraction.

Nervous Tissue

Nervous Tissue Facts• main component of the nervous system.• Contains 2 major cells types:1. Neurons – are highly specialized nerve cells that

generate and conduct nerve impulses.2. Neuroglia – are supporting cells that are non-

conducting that insulate and protect the neurons.

Nervous TissueStructure – • Neurons are branching cells.• Cell processes may be quite

long.• Motor neurons have many

dendrites but one axon.• Motor neurons are

myelinated.• Cell body is called a cyton.• Supporting connective tissue

is called Neuroglia

Cyton Neuroglial Cells

Nervous Tissue

Location – • Brain• Spinal Cord• Peripheral Nerves

Nervous Tissue

Function – • coordinates activities

between the brain, spinal cord and body organs.

Nucleus of Neuroglial Cell

Cell Nucleus

X – Section of Spinal Nerve

Epineurium – surrounds several groups of neurons.

Perineurium – surrounds a group of neurons.

EpineuriumPerineurium

X – Section of Spinal Nerve

Endoneurium – is the covering around one neuron.

Axon – is the central grey spot.

Myelin – is the white surrounding the axon.

Endoneurium Axon

X – Section of Spinal Cord

White Matter Grey Matter

Central Canal

Meninges

1.) a.) Name the tissue type below.

b.) What type of cell is labeled B?

B

2.) a.) Where in the body would you find this tissue type?

b.) What protein accumulates in the cells as you approach the apical surface of this tissue?

3.) a.) Name the cell type labeled A.b.) Name the structure labeled B.

BA

4.) a.) Name one function of this tissue type.b.) Name one place in the body you would find this

tissue.

5.) a.) Name the fiber type labeled A.b.) Name this tissue type.

A

6.) a.) What is the function of mast cells?

b.) What is the function of fibroblasts?

7.) a.) Name this tissue type.b.) What is the function of the cell labeled B?

B

8.)a.) Where in the body would you find this tissue type?b.) What protein is the fiber labeled B made from?

9.) a.) Name this tissue type.b.) Name the structure labeled B.

B

10.) a.) Name this tissue type.b.) Name one function of this tissue type.

EXAM NOTES

1. Exam runs on November 13th from 4-7pm.2. It is in IB1101.3. It will be a power point exam similar to the practice

tests.4. You will have 1 minute per slide and 2 questions per

slide. 5. The exam should take 21 minutes to write.