Hair arises from which type of tissue? ectoderm mesoderm epidermis dermis more than one of the above
Congenital absence of hair is called: hypertrichosis anonychia athelia or amastia pili torti atrichia or alopecia
The breast develops along the mammary line/ridge, or the milk line. Which of the following is a possible site for accessory nipples or breasts? cubital fossa or anterior elbow popliteal fossa or behind the knee groin lower lateral neck above clavicle mid-axillary line at the 5th intercostal space
Which of the following is NOT considered a "birthmark"? angioma hemangioma port wine stain ichthyosis
Failure of the brain to grow may result in: plagiocephaly craniostenosis acrocephaly scaphocephaly microcephaly
Which of the following is NOT true concerning skeletal development? Membrane bones include the clavicle and the
bones of the cranial vault and face. During membrane bone formation, no
cartilaginous model is formed. Endochondral bone formation involves
calcification of cartilage, which is later
replaced by true bone. Membrane bone lacks periosteum.
Lobster claw deformity is characterized by: ectrodactyly brachydactyly syndactyly polydactyly more than one of the above
Klippel-Feil syndrome is characterized by: short neck due to small cervical vertebrae torticollis high forehead restricted movements of the neck
Somitomeres, paraxial mesoderm cranial to the somites, give rise to much of the skeletal muscle in the head EXCEPT: extrinsic muscles of the eye temporalis tongue muscles muscles of facial expression muscles of mastication
The sphenoid bone is derived from which portion of the embryonic skull? cartilaginous neurocranium membranous neurocranium cartilaginous viscerocranium membranous viscerocranium branchial cartilage
Which of the following is NOT true with respect to the development and growth of bones: Primary centers of ossification appear before
the end of the third month of development. Almost all secondary ossification centers
appear after birth. Longitudinal growth of a long bone occurs in
the areas of the epiphyseal plates. Membrane bones can be recognized by their
typical histological structure.
Achondroplasia is characterized by all of the following EXCEPT: inferior sexual development short limbs average intelligence broad, flat face undershot jaw
Digits which are abnormally short are called: syndactyly polydactyly dichuris amelus none of the above
The nerve supply to a muscle can be used as an indicator of: the time of differentiation of a particular
muscle the primary germ layer from which a given
muscle arose the time of myofibril formation in the muscle the level of origin and path of migration of
the muscle
The notochord is replaced by the: ependyma vertebral column spinal canal dorsal roots spinal cord
What gene or factor in the dorsal ectoderm is responsible for the dorsoventral axis formation of the limbs? Wnt-7a En-1 Hox FGF-8
What gene or factor is responsible for proximodistal axis formation of limbs? Wnt-7a En-1 Hox FGF-8
A newborn baby is found to have her 3rd and 4th digits fused. What is the term for this condition? Ectrodactyly Brachydactyly Polydactyly Syndactyly Hemimelia