Embryology - Lecture 11

What does epidermis develop from?
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Terms in this set (29)
What does epidermis develop from?
Surface ectoderm
What does dermis develop from?
mesenchyme
Dermis develops from three different source. Name the source and the part of the body that is affected.
Lateral Plate mesoderm - limbs and body wall
Paraxial mesoderm - back
Neural crest - face and neck
What layer of the integument eventually disappears?
Periderm
What do melanocytes arise from?
neural crest cells
Epidermis proliferates to form _______. ________ invaginates to from __________. _________ are rapidly filled with _______ in which muscles and nerves develop
hair bud; hair bud; hair papilla; hair papillae; mesoderm
What forms when cells from the hair bud become spindle-shaped and keratinize?
Hair shaft
What develop as small buds off the wall of the hair follicle?
Sebaceous glands
What develop from epidermal proliferations?
Sweat glands and mammary glands
Arrector pili m. is derived from what?
mesenchyme
Mammary lines are AKAmammary ridges or crestsMammary lines are lines of thickened _____ in the embryo. They extend from _______ to ________ region. They almost completely disappear, except in the ________epidermis; axilla; inguinal; breastWhat is polythelia?accessory nipplesWhat is polymastia?extra complete breastNails are formed when _______ thickens at the tip of the digit to from the ______ _______. This ________ migrates to the ________ side of the digit. ________ of surrounding tissue creates a _________ for each nailepidermis; nail field; nail field; dorsal; proliferation; depressionThe skull is divided into two areas. The ______ surrounds the brain and the ________ makes up the facial skeletonneurocranium; viscerocraniumFlat bones surrounding the brain are known ascalvariumFlat bones surrounding the brain develop by ______ ossification while the base of the skull forms by _____ ossificationintramembranous; endochondralWhat bones make up the neurocranium?frontal (1), sphenoid (1), ethmoid (1), occipital (1), temporal (2), parietal (2)Which neurocranial bones are derived from neural crest cells?Frontal, ethmoid, sphenoid (partially)Which neurocranial bones are derived from paraxial mesoderm (somites)Parietal, temporal, occipital, sphenoid (partially)What is the dividing point between the prechordal and chordal chondrocranium?Drawing a line through the sella turcicaWhat is the rostral limit of the notochord?Sella turcicaWhat rests in the sella turcicapituitary glandAnterior to the sella turcica line is _______ and is derived from _______. Posterior to the line is _______ which is derived from _____ _____ aka _________prechordal; neural crest cells; chordal; occipital sclerotomes; paraxial mesodermAre the lesser and greater wing of the sphenoid, and the ethmoid bone chordal or prechordal? What are they derived from?They are prechordal and are derived from neural crest cellsAre the body of the sphenoid, petrous part of temporal, and base of occipital chordal or prechordal? What are they derived from?chordal; derived from occipital sclerotomes (paraxial mesoderm)The viscerocranium is mainly formed by what?1st pharyngeal archWhat are the bones of the viscerocranium?Mandible, vomer, maxillae, inferior nasal conchae, zygomatics, palatines, nasals, lacrimals.