Lecture 7 Flashcards
Name the 3 types of muscle tissue and their function
- Skeletal muscle – Structure – Innervation – Types
- Cardiac muscle – Structure – Innervation
- Smooth muscle – Structure – Innervation
What type of muscle is represented in the picture
Skeletal Muscle
What type of muscle is represented in the picture
Cardiac Muscle
Involuntary
What type of muscle is represented in the picture
Smooth muscle
Involuntary
Name the layers of Skeletal Muscle
Epimysium – dense CT
- Perimysium – derived from the epimysium, surrounds a fascicle, a functional muscle unit
- Endomysium – reticular fibers and extracellular matrix
What is this a cross-section of
Skeletal muscle
what type of muscle is presented in this Longitudinal section
Skeletal muscle
Who do you love
Nash
What is represented by the C and N in the skeletal muscle image below
C – capillary
N - nucleus
Label the picture below
Label the picture below
What type of innervation does skeletal muscle have as well as what neurotransmitter is it associated with
Voluntary innervation by the peripheral nervous system
- Neuromuscular junction (synapse) between unmyelinated axonal terminal (motor end plate) and individual muscle fiber
- Neurotransmitter – acetylcholine
What is a motor unit
a group of muscles innervated by a single spinal nerve
What is depicted in the image
Muscle spindle
Lec 6, Slide 16
Label the picture
What is depicted in the image
What type of muscle is depicted
Cardiac muscle
Single, central nucleus • Intercalateddiscs
• Branchedcells
• Involuntaryinnervation
What type of muscle is this a cross section of
cardiac muscle
what type of muscle is depicted in this longitudinal section
Cardiac muscle
Identify the labeled image
Cardiac Muscle
G – gap junction
F – fascia adherens
D - desmosome
What is depicted in the image
Intercalated discs
- Bind cardiac myocytes
- Anchor myofibrils: α-actinin in fascia adherens, Desmosomes (desmin -intermediate filament)
- Gap junctions in longitudinal portions form functional syncytium
Identify the area circled
transverse tubule system (diads)
What is indicated by the arrows
Purkinje fibers
Purkinje Fiber
Involuntary innervation by autonomic nervous system
Pacemaker system of modified cardiac muscle cells that generate and coordinate myocardial contractions during cardiac cycle (Purkinje system)
What type of muscle is this and what do the letters represent
Smooth Muscle
C: longitudinal section
G: ganglion (neurons)
L: cross section
What type of muscle tissue is this
Smooth muscle
Smooth muscle
- Sheets or bundles in the walls of many organs (e.g. GI & respiratory tracts, blood vessels)
- Lack of striation
- Spindle-shaped cells
- Single nucleus
- Communication via gap junctions
- Involuntary innervation
- Smooth muscle cells synthesize collagen, elastin, and proteoglycans
Name the type of muscle
Smooth muscle
What type of muscle is in this picture
Smooth muscle
What type of muscle is this a longitudinal section of
Smooth Muscle
What muscle type is depicted in the cross section shown
Smooth Muscle
What type of muscle tissue is depicted below
Smooth Muscle
Smooth muscle contraction
• Involuntary innervation by autonomic nervous system
Small muscle group – high degree of autonomic innervation (e.g. iris of the eye)
Large muscle group – generate their own low level of contractions, autonomic innervation modifies contractions (e.g. peristalsis in the gastrointestinal tract)
