Myology ( Classification of Muscles)

Discussion onsite / Short quiz

Skeletal Muscle

Striated, voluntary muscle

Skeletal Muscle

Nuclei are peripherally located

Skeletal Muscle

Fibers are made up of long, cylindrical, multinucleated cells with dark and light bands

Skeletal Muscle

Attached to bones

Gastrocnemius

stomach-shaped muscle of caudal crus

Rectus femoris

cranial thigh region

Cardiac Muscle

Striated, involuntary muscles

Cardiac Muscle

Limited to myocardium (middle, thickest layer) of heart

Cardiac Muscle

Nuclei are centrally located

Cardiac Muscle

Fibers are branching

Smooth Muscle

Non-striated, involuntary muscle

Smooth Muscle

Spindle-shaped; muscle fibers have tapering ends

Smooth Muscle

Muscles located at the urinary bladder, intestine, bronchi, skin

Arrector pili muscle of skin

responsible for the erection of skin hairs

proximal portion of esophagus

Almost all internal organs are lined with smooth muscle except the _______

Striation

___________ is due to the presence of alternating dark and light bands

Dark Band

(A band) anisotropic to polarize light

Light Band

(I band) isotropic to polarize light

Voluntary

Under central nervous system (CNS) control

Classification of Muscles

1.       Movement of the skeletal framework, mediated by skeletal muscles

2.       Contraction and beating of heart, mediated by cardiac muscles

3.       Peristalsis - a process of transporting ingesta along the gastrointestinal tract (GIT), mediated by smooth muscles

4.       Erection of skin hair (arrector pili muscle)

5.       Movement of the eyeball

Involuntary

Under autonomic nervous system (ANS) control

Skeletal Muscle

Movement of the skeletal framework, mediated by __________

Cardiac Muscle

Contraction and beating of heart, mediated by ___________

Peristalsis

a process of transporting ingesta along the gastrointestinal tract (GIT), mediated by smooth muscles

Superior oblique, Inferior oblique, Dorsal rectus, Ventral rectus, Lateral rectus, Medial rectus, Retractor bulbi

7 extraocular muscles surrounding the eyeball

Retractor bulbi

retracts eyeball to the inside