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13 Cards in this Set
- Front
- Back
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5 derivatives of branchial arches |
Muscle Blood Vessels Nerves Bone Cartilage |
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Neural crest cell develops into: |
Bone Cartilage |
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Somitomeric mesoderm develops into: |
Muscles Arteries |
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Nerves that supply muscles developed from branchial arches |
SVE's |
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1st branchial arch (CMN) |
"Mandibular Arch" Cartilage = from Meckel's cartilage - Malleus and Incus; Ossification of Meckel's = mandible and sphenomandibular ligament Muscle = Muscles of mastication; Medial and Lateral Pterygoids, Masseter, Temporalis; Mylohyoid, anterior belly of digastric, tensor tympani and tensor veli palitini Nerve = trigeminal nerve (V)
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2nd branchial arch (CMN) |
Hyoid Arch Cartilage = Reichert's cartilage - Stapes, styloid process, temporal bone, lesser horn/upper body of hyoid Muscle = Stapedius, stylohyoid, posterior belly of digastric, muscles of facial expression Nerve = Facial (VII)
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3rd branchial arch (CMN) |
Cartilage = greater horn and lesser body of hyoid (compliments 2nd BA) Muscle = stylopharyngeus Nerve = glossopharyngeal nerve (IX) |
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4th and 6th Branchial arch (CMN) |
Cartilage = fuse to form laryngeal cartilages = thyroid, cricoid, arytenoid, corniculate, cuneform Muscle = cricothyroid, levator veli palantini, constrictors of pharynx, intrinsic muscles of larnyx Nerve = Vagus nerve, superior laryngeal branch and inferior branch of vagus |
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Grooves |
4 grooves, but only 1 is viable 1st groove = external auditory meatus 2 - 4 = degenerate If 2nd pharyngeal pouch and groove persist = pharyngeal fistula |
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Aortic arches |
1 and 2 degenerate 3 = ICA stem 4 = proximal subclavian artery on the right, portion of arch of aorta on the left 6 = pulmonary arteries and ductus arteriosus |
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5 pharyngeal pouches |
1 = tubotympanic recess or the external auditory meatus 2 = Tonsillar fossa and palatine tonsils 3 = dorsal wing = inferior parathyroid; ventral wing = thymus 4 = dorsal wing = superior parathyroid; ventral wing = thymic tissue 5 = part of 4th pouch; ultimobranchial bodies - parafollicular cells - calcitonin |
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Development of Parathyroids and thymus gland |
3rd pharyngeal pouch = inferior parathyroid (from dorsal wing) and thymus gland (from ventral wing) 4th pharyngeal pouch = superior parathyroid (dorsal wing)
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Foramen cecum and thyroglossal duct cysts |
Thyroglossal duct is obliterated leaving the foramen cecum, connects the thyroid to the tongue Thyroglossal duct cysts may form along path of descent due to ectopic thyroid tissue; difficult to remove w/out removing portions of hyoid bone |
