LAB - PNS, Muscle, Endocrine Flashcards
a bundle of nerve fibres
fascicle
Pacinian copuscle
pressure, coarse touch, rapid vibration
skeletal (strated) muscle
- elongated, multinucleated cells
- flat nuclei, just below sarcolemma
- cross striations, no branching
- voluntary control
- strong, quick, and discontinuous contraction
- limbs, torso, etc.
cardiac muscle
- long, cylindrical cells; 1 or 2 nuclei centrally located
- striated, intercalated discs present
- branched
- T-tubule system w sarcoplasmic reticulum
- involuntary
- contractions are strong and continuous
- present in heart
smooth muscle
- cigar or spindle shaped cells
- central nucleus
- no striations, branching fasciculi (bundles of muscle fibres)
- involuntary control, contractions are weak and slow
- found in arterial walls
- walls of hollow organs/viscera
(intestines)
contractile unitof muscle
sarcomere; muscle unit runs from Z to Z line
- most electon dense area
intercalated discs may be easier to see with this stain
Masson Trichrome
which classes of muscles are present in the esophagus?
smooth and striated muscle
anterior and posterior lobe of pituitary gland
- adenohypophys (iarger)
- neurohypophysis
two class of cells in the anterior lobe
acidophils and basophils
this lobe consists of unmyelinated axons of secretory nerves; ell bodies found in hypothalamus; don’t synthesize hormones but act as a storage or release depot
posterior lobe
pituicytes
in neurohypophysis; role similar to neuroglia
thyroid gland
- two lobes united by an isthmus
- follicle = cuboidal; colloid is dark pink
- surrounding follicles = parafollicular cells (C cells); can be single cells or clumps of cells; clear cytoplasm; synthesize calcitonin; different embryonic origin
parathyroid gland
- four small glands that lie behind thyroid gland; often embedded in its capsule
- chief or peripheral cells
- oxyphil cells (more pink cytoplasm)
adrenal gland
two zones = cortex and medulla
