What is the origin of the sternocleidomastoid?

1) B
Explanation:
A) The sternocleidomastoid does not attach to the larynx.
C) The sternocleidomastoid does not attach to the temporal bone.
D) The sternocleidomastoid does not attach to the scapula.

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2) C
Explanation:
A) The sternohyoid is an infrahyoid muscle.
B) The omohyoid is an infrahyoid muscle.
D) The sternothyroid is an infrahyoid muscle.

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3) D
Explanation:
A) The geniohyoid is a suprahyoid muscle.
B) The digastric muscle is a suprahyoid muscle.
C) The mylohyoid is a suprahyoid muscle.

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4) D
Explanation:
A) The posterior belly is not the principal muscle of the neck.
B) The digastrics muscle is not the principal muscle of the neck.
C) The anterior belly is not the principal muscle of the neck.

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5) D
Explanation:
A) A blastomere is not a solid ball of identical cells.
B) A blastocyst is not a solid ball of identical cells.
C) A zygote is not a solid ball of identical cells.

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6) B
Explanation:
A) Cleavage is not the fusion of gametes.
C) Cleavage is not meiosis.
D) One of the listed answers is correct.

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7) B
Explanation:
A) The trophoblast does not become the allantois.
C) The trophoblast does not become the archenteron.
D) The trophoblast does not become the lining of the endometrium.

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8) C
Explanation:
A) The inferior constrictor originates from the cricoids and thyroid cartilages of the larynx.
B) The superior constrictor originates from the pterygoid process of the sphenoid bone and the medial surfaces of the mandible.
D) The tensor veli palatine originates from the sphenoid spine.

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9) B
Explanation:
A) The superior constrictor constricts the pharynx to propel the bolus into the esophagus.
C) The laryngeal elevators elevate the larynx.
D) The inferior constrictor constricts the pharynx to propel the bolus into the esophagus.

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10) A
Explanation:
B) The morula stage is not the first stage in preembryonic structures.
C) The morula is not the first stage in preembryonic structures.
D) The blastocyst is not the second stage of preembryonic structures.

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