Comparative Muscular System — Flashcards

Flashcard 1: The tongue muscles are derived from the myotomes of the _____ somites.

Answer: occipital

Flashcard 2: _____ visceral efferent fibres of the facial nerve carry motor fibres to muscles of facial expression

Answer: Special

Flashcard 3: An example of strap-like parellel muscle is _____ and sternohyoid

Answer: sartorius

Flashcard 4: Levator ani muscle takes its origin from the body of the _____, the arcus tendinous of the levator ani (a thickened part of the _____ fascia), and the _____ spine.

Answer: pubis; obturator; ischial

Flashcard 5: The sphincter and dilator pupillae muscles are formed from the _____derm

Answer: neural ecto

Flashcard 6: The main muscles that open the jaw (depress the mandible) are the _____, digastric, and geniohyoid

Answer: lateral pterygoid

Extra: The lateral pterygoid is the primary muscle of mastication for jaw opening (mandibular depression). The suprahyoid muscles (digastric, geniohyoid, and mylohyoid) assist in depression when the hyoid bone is fixed by the infrahyoid muscles.

Flashcard 7: The cardiac and smooth muscles are derived from the _____ mesoderm.

Answer: splanchnic

Flashcard 8: What are the muscular derivatives of the second arch?_____

Answer: Stapedius, Stylohyoid, Facial Muscles (Buccinator, Platysma, Posterior belly of digastric) (5)