Which statement regarding the cornea is not true?
A. The cornea lacks blood vessels (it is avascular).
B. The cornea lacks nerves (it is aneural).
C. The internal corneal epithelium obtains oxygen from fluid in the anterior chamber of the eye.
D. The external corneal epithelium receives nourishment from lacrimal gland secretions.
E. The cornea serves to refract light rays.
Answer: B
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The portion of the adult brain that includes the cerebral peduncles, superior colliculi, and inferior colliculi is derived from which secondary brain vesicle?
A. Diencephalon B. Metencephalon C. Mesencephalon D. Telencephalon E. Myelencephalon
Crural muscles are those that move the
A. vertebral column. B. hip. C. thigh. D. wrist. E. ankle, foot, and toes.
The clavicle articulates with the scapula at the ________
A) sternoclavicular joint B) acromioclavicular joint C) suprascapular notch D) coracoid process
Closure of the tricuspid and mitral valves occur during:
A. ventricular relaxation. B. ventricular contraction. C. the diastolic phase. D. atrial contraction.