A cleft lip results when
A. the two halves of the secondary palate do not fuse.
B. the frontonasal and maxillary processes do not fuse.
C. the lateral edges of the nasal placodes do not fuse with the maxillary processes.
D. the maxillary processes do not fuse with the mandibular processes.
E. None of these choices is correct.
(
Question 2) Arm and legs buds appear at about 28 days from
A. the coelom.
B. apical ectodermal ridges.
C. somitomeres.
D. neural crest cells.
(
Question 3) Which of the following structures is NOT involved in the formation of the face?
A. apical ectodermal ridges
B. frontonasal process
C. maxillary processes
D. mandibular processes
(
Question 4) Which of the following is NOT a possible route for neural crest cells?
A. melanocytes
B. autonomic ganglion neurons
C. adrenal cortex
D. sensory ganglia
E. enteric nervous system neurons
(
Question 5) Somites give rise to
A. nerves.
B. blood.
C. glands.
D. muscles.
E. spinal cord.
(
Question 6) Cells of the neuroectoderm become all of the following EXCEPT the
A. brain
B. spinal cord
C. postganglionic autonomic neurons
D. posterior pituitary gland
(
Question 7) Segments of mesoderm that will form muscles are
A. mesonephros.
B. mandibular processes.
C. neural tube.
D. secondary palate.
E. somites.
(
Question 8) Which of the following organs develops from evaginations along the early digestive tract?
A. heart
B. adrenal medulla
C. lungs
D. nasal cavity
E. kidneys
(
Question 9) The oropharyngeal and cloacal membranes, when opened, allow the _____ to open to the outside.
A. liver
B. skin
C. lungs
D. digestive tract
E. ears
(
Question 10) Which germ layer are the tonsils derived from?
A. ectoderm
B. mesoderm
C. endoderm
Quick Reply
