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27 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are the muscles of mastication and what are their actions?
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Digastricus m. - open jaws
Masseter m. Temporalis m. Lateral pterygoid m. Medial pterygoid m. - all close jaws |
Hint: there are 4 that close and one that opens
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What nerve(s) innervate the muscles of mastication?
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Trigeminal (CNV)
Facial (CNVII) - caudal belly of digastricus |
More than one...
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What embryologic origin do the muscles of mastication have?
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All from 1st pharyngeal arch EXCEPT for caudal belly of digastricus (2nd pharyngeal arch)
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The muscle with the different innervation also has the different embryological origin
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ID these muscles AND provide the origin, insertion and innervation.
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A - Temporalis m.; Temporal fossa to coranoid process of mandible; mandibular n. of CNV
B - Masseter m.; zygomatic arch to masseteric process of mandible; mandibular CNV C - Digastricus; jugular process to ventromedial border of mandible; mandibular CNV and CNVII |
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T or F:
The only branch of the trigeminal n. (CNV) with motor innervation is the mandibular branch. |
True!
All three branches have provide sensory innervation but the mandibular branch is also motor. |
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T or F:
Only carnivores and sheep have two heads to the masseter m. while all others have three heads. |
False. It's the other way around...
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T or F:
The digastricus inserts more rostrally on cats than in dogs which explains why cat bites have a greater pressure per unit area than dogs. |
False! While the digastricus does insert farther rostrally, it has nothing to do with bite pressure! This insertion allows cats to open their mouths wider!
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Which is larger; the medial or lateral pterygoid muscle?
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Medial is larger and stronger!
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ID these muscles and provide the origin, insertion, and innervation.
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A - Masseter m.; zygomatic arch to masseteric fossa
B - Medial pterygoid m.; pterygopalatine fossa to medial angular process of mandible C - Lateral pterygoid m.; ventral to alar canal to medial surface of mandibular condyle All innervated by mandibular n. of CNV |
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Yarrrrr! What be these muscles of mastication?
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A - Temporalis m.
B - Lateral pterygoideus m. C - Medial pterygoideus m. D - Masseter m. E - Digastricus m. |
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What are the intrinsic muscles of the tongue?
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Proper lingual mm.
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Only one name...
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What are the extrinsic muscles of the tongue?
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Styloglossis m.
Hyoglossis m. Genioglossus m. |
Yarrr...thar be 3...
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What is the innervation for all muscles of the tongue?
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Hypoglossal n. (CN XII)
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This nerve exits the hypoglossal foramen...
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What muscle or muscles is Bill the cat using to give you the Bronx Cheer?
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Proper lingual mm. - major action (protrudes tongue and allows for fine lingual motion)
Genioglossus m. draws tongue forward. |
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ID these muscles of the tongue and provide their action
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A - Genioglossus m. - depress tongue, draw tongue forward, curl tip down (rostral fibers)
B - Hyoglossus m. - retract and depress tongue C - Styloglossus m. - retract tongue |
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What is the muscle fiber orientation of the proper lingual mm.?
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Dorsal longitudinal
Ventral longitudinal Transverse Vertical |
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What are the functions of the hyoid apparatus?
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Suspension of the larynx (attaches it to skull)
Anchors tongue |
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What are the functions and innervations of the hyoid muscles?
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Involved in swallowing, retching, and lapping.
Innervated by various cervical and cranial nn. |
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Which muscles draw the hyoid caudally?
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Sternohyoideus m.
Sternothyroideus m. Thyrohyoideus m. |
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Which muscles draw the hyoid cranially?
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Geniohyoideus m.
Mylohyoideus m. |
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Which muscle has an effect on the hyoid apparatus without directly inserting or originating on any hyoid bones?
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Sternothyroideus m.
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Remember - laryngeal cartilages are attached to the hyoid!
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Which cranial nerves innervate hyoid muscles?
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CNV, CNVII, CNXII, CNIX
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ID these muscles!
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A - Mylohyoideus m.
B - Styloglossus m. C - Hyoglossus m. D - Geniohyoideus m. E - Thyrohyoideus m. F - Sternothyroideus m. G - Sternohyoideus m. |
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ID THIS!!!
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A - Geniohyoideus m.
B - Mylohyoideus m. C - Basihyoid bone |
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What is the action of the stylohyoideus m.?
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Raises basihyoid bone
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Hint: it inserts on the basihyoid
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What is the action of the ceratohyoid m.?
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Decrease angle between the thyrohyoid and ceratohyoid bones.
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Which pharyngeal structures are close when swallowing?
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Jaws close
Intrapharyngeal ostium closes Glottis closes |
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