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MUSCLE TISSUE
Aggregate of specialized cell
elongated and arranged in…
MUSCLE TISSUE
- Aggregate of specialized cell
- elongated and arranged in parallel rows
- main roll: contraction
- embryonic layer: MESODERM
3 type TISSUE:
SKELETAL STRIATED MUSCLE TISSUE
- Volunteer
- voluntary movements
- mantein posture, protection and support of the organs
- characteristics: banding, transverse striated
- large polynucleated syncytia
- bundles of muscle fibers joined together by connective tissue
.
where:
- musculoskeletal system
- tongue
- m. of the eye
- anal and bladder sphincters
- branch m. non-volunteer in the pharinx, larynx and esophagus
- part of diaphragm
EPIMYSIUM:
- dense connective tissue
- surround muscles
PERIMYSIUM:
- branch of epimysium
- divide the underlying tissue into smaller regions
ENDOMYSIUM:
- branches of reticular connective tissue
- basement membrane wraps the fiber
-
externally continuous with TENDON
- dense connective tissue structure
- bind and anchor the muscle to the bone
- continue as PERIOSTEUM
-
SMOOTH M. TISSUE
- mononuclear elements
- innervated by the ANS
- unvoluntary
.
where
- walls of the vessels
CARDIAC STRIATUM M. TISSUE
- majority of the hearth
- striated fibers, not sycyntial with ANS
- indipendent contraction
MUSCLE CELLS
SKELETAL STRIATED MUSCLE CELL / FIBRO CELL
- large
- cylindrical shape
- few cm in lenght (3cm)
- polynuclear --> elongated nuclei close to the plasma membrane
- striated
-
CARDIAC STRIATED MUSCLE CELL
- light and dark banding
- small
- mononuclear --> nucleus in central position
- not form morphological syncytia
SMOOTH MUSCLE CELL
- Spindle shape
- elongated
- central globular part --> nucleus
- thin ends --> allow the inserction with near cells
MYOEPITHELIAL CELL
- characteristics between epithelial tissue cell and mucular tissue
- contractility --> contractile elements in cytoplasm
.
where: exocrine glandular epithelial
- adhere to the adenomere of the glands
- contracting --> squeezing and a consequent release of the secretion
MYOSTATIN
- hormone that inhibits excessive growth of musce tissue
- if not --> kidney problems
-