Quiz 2 Flashcards
Span of renewal of Stratum basale
15-30 days
layer of the epidermis responsible for the regeneration of the other layers in the epidermis
Stratum Basale
Binds the stratum basale to the basement membrane
Hemidesmosomes
Thickest epidermal layer
Stratum spinosum
Characteristic of cells composing the stratum spinosium
Polyhedral Keratinocytes
Layer of skin synthesizing keratin
Stratum Spinosum
Gives spiny appearance of stratum spinosum
desmosomes
Makes up the Malphigian Layer
Stratum Basale and Spinosum
Epidermal layer only found in thick skin
Stratum Lucidum
What is Psoriasis vulgaris
Abnormal increase in number of proliferating cells in the basal layer
Releases pigment to the keratinocytes
Melanosomes
Depigmentation disorder resulting from degeneration and disappearance of entire melanocytes
Vitiligo
Hereditary inability of melanocytes to synthesize melanin
Albinism
Epithelial tactile cells abundant in fingertips and base of hair follicles
Merkel’s cells
Two layers of dermis
Papillary and reticular
Characteristic component of papillary layer
Loose CT
Characteristic component of reticular layer
dense irregular CT
Responsible for tone and texture of the skin
Dermis
Responsible for skin elasticity
Reticular layer of dermis
Regular lines of tension in the skin formed by collagen and elastic fibers
Langer’s Lines
Gland classification of sebaceous gland according to morphology and mechanism of secretion
Simple Branched Acini, Holocrine
Glad classification of sweat glands according to morphology
Simple coiled tubular
Gland involved in adrenergic sweating
Apocrine glands
Gland involved in cholinergic sweating
Eccrine glands
Immature cartilage forming cells located at the periphery of the perichondrium
Chondroblasts
Chondroblasts trapped in the matrix
Chondrocytes
Mature cells surrounded by ECM that lie in lacunae
Chondrocytes
Area immediately surrounding chondrocytes
Territorial matrix
Most abundant inorganic component of bone
Calcium hydroxyapatite
Hormone that stimulates bone matrix production
Parathyroid hormone (PTH)
Differentiated osteoblasts surrounded by matrix enclosed with lacunae
Osteocytes
Important in bone resorption and bone remodelling
Osteoclasts
Hormone that activates bone digestion/resorption
Calcitonin
Site of bone growth and resorption
Endosteum
Released in acrosome reaction to digest zona pellucida
Acrosin
Zona reaction
Inactivates sperm receptors which prevents polyspermy
Post fertilization events
Pronucleus formationSyngamyCleavageCompactionMorulation
16-cell stage
Morula
Forms placenta
Tropoblast
Forms embryo
Embryoblast
Forms amniotic cavity
Epiblast
Divisions of extraembryonic mesoderm
SplanchnicSomatic
Determines body axes
Primitive Streak
First cels to migrate inward in gastrulation that displace hypoblast cells aside
Endoderm
Origin of neural crest
Ectoderm
