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Skeletal Muscle vs. Dense Regular Connective Tissue (tendon). One more time…. Skeletal muscle . Tendon. Muscle Fiber Types . Cross Section of Skeletal M uscle S tained for Myoglobin

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Skeletal muscle vs dense regular connective tissue tendon
Skeletal Muscle vs. Dense Regular Connective Tissue (tendon)

  • One more time….

Skeletal muscle

Tendon


Skeletal muscle vs dense regular connective tissue tendon

Muscle (tendon)

Fiber Types


Skeletal muscle vs dense regular connective tissue tendon

Cross Section of Skeletal (tendon)Muscle Stained for Myoglobin

-Type I Fibers (aka. Red Fibers, Slow Oxidative): Darkly staining b/c more myoblobin, slow twitch, fatigue resistant, but generate less tension

-Type IIa Fibers (aka. Intermediate fibers, fast glycolytic oxidative fibers): Variable staining, fast-twitch, fatigue resistant, capable of anaerobic glycolysis

- Type IIb Fibers (aka. White Fibers, Fast Glycolytic): Lightest staining, fast-twitch, fatigue prone, lots of glycogen, low myoglobin, round, large

White

Red


Skeletal muscle vs dense regular connective tissue tendon

Nerve Stuff (tendon)


Skeletal muscle vs dense regular connective tissue tendon

Motor End Plate (tendon)

-where black staining nerves

contact muscle

-looks like the rubber part of a plunger



Skeletal muscle vs dense regular connective tissue tendon

Peripheral Nerves: (tendon)

-In the accurate words of the legendary Dr. Boggus:

“Circle of wavy shit”


Skeletal muscle vs dense regular connective tissue tendon

Peripheral (tendon)Nerves:

-Endonuriem: around each axon

-Perinuriem: around each peripheral nerve

-Epinuerium: around each

bundle of peripheral nerves


Skeletal muscle vs dense regular connective tissue tendon

Peripheral (tendon)Nerves:

-Endonuriem (EN): around each axon

-Perinuriem (P): around each peripheral nerve

-Epinuerium(EPI): around each

bundle of peripheral nerves

*from demo on blackboard


Skeletal muscle vs dense regular connective tissue tendon

Peripheral Nerve: Longitudinal Section (tendon)

-Field of bubbly wavy shit

-Nodes of Ranvier are the short vertical lines b/w Shwann cells

(ie the ties b/w the sausage links)


Skeletal muscle vs dense regular connective tissue tendon

Myelinated (tendon) Nerve:

-Nuerilemma: surrounds the myelinated cells

-Node of Ranvier: the dark line b/w Shwann cells where the nuerilemma

appears pinched.

Myelin

Axon

Myelin


Skeletal muscle vs dense regular connective tissue tendon

Myelinated (tendon) Nerve:

-Myelin sheath is stained black (the small black circles)


Skeletal muscle vs dense regular connective tissue tendon

Ganglion: (tendon)

-Looks like a bunch of FRIED EGGS

-DON’T confuse this with peripheral nerve (circle of W.S.)! In a peripheral nerve

cross section, the dark spot is an axon, not a nucleus w/ a nucleolus, and the white

of the egg is a pale myelin sheath with a dark outline as opposed to cell cytoplasm.


Ganglion vs peripheral nerve
Ganglion vs (tendon). Peripheral Nerve

Ganglion

Peripheral Nerve

-Circle of W.S.

-Fried eggs

-Dark axons

surrounded

by pale myelin

sheaths with darker

outlines

-Lots of satellite

cells!

-Darkish staining

cytoplasm in

neurons that tends

to look shrunken/pull

away from surroundings

(ie white space)

-I spy a nucleolus!