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15 Cards in this Set
- Front
- Back
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First (mandibular) Arch
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N: Trigeminal (CN V)
M: Muscles of Mastication, Mylohyoid, Ant. Belly of Digastric, Tensor Veli Palatini, Tensor Tympani S: Head of Malleus, Upper Part of Incus, (Meckel's Cartilage) A: First Pair of Aortic Arches Remaining Parts of Maxilla May Contribute to Ext. Carotid |
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Second (hyoid) Arch
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N: Facial (CN VII)
M: Facial Expression Stapedius Stylohyoid Post. Belly of Digastric S: Handle of Malleus Lower Part of Incus Stapes Styloid Process Lesser Cornu, Upper Body of Hyoid A: Second Pair of Aortic Arches Persists as Stems of Stapedial AA. |
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Occipital Somites Derivatives + Nerves
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All intrinsic and extrinsic muscles of tongue except palatoglossus
N: Hypoglossal (XII) |
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Third Arch
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N: Glossopharyngeal (CN IX)
Muscle: Stylopharyngeus S: Greater Cornu of Hyoid Lower Part of Body of Hyoid A: Third pair of Aortic Arches Proximal Parts : Common Carotid Distal Parts: Parts of Int. Carotids |
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Fourth Arch
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N: Vagus (X)
M: Cricothyroid Levator Veli Palatini Pharyngeal Constrictors Palatoglossus Salpingopharyngeus Palatopharyngeus S: (laryngeal cartilages) A: 4th pair of Aortic Arches Left Arch: Part of Aortic Arch Right Arch: Part of R. Subclavian A. note: left subclavian not derived from aortic arch |
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Fifth - Sixth Arches
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N: Cranial Root Spinal Accessory Nerve (CN XI via Vagus)
M: All Instrinsic mm. of Larynx (except Cricothyroid Muscle) Levator Veli Palatini Palatoglossus Pharyngeal Constrictors Salpingopharyngeus Palatopharyngeus S: (laryngeal cartilages) A: fifth pair of aortic arches (degenerate) Sixth pair of aortic arches L&R proximal parts persist as Pulmonary AA L. Distal - ductus arteriosus R. Distal - degenerates |
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First Pharyngeal Pouch
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Tubotympanic Recess
Prox. Part - Pharyngotympanic (Auditory) tube Distal part - Middle ear cavity & Mastoid Antrum Endoderm contributes to Tympanic Membrane |
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Second Pharyngeal Pouch
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Most if Obliterated
Crypts of Palatine Tonsil |
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Third Pharyngeal Pouch
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Ventral Part - Primordia of Thymus
Dorsal Part - Inf. Parathyroid Glands |
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Fourth Pharyngeal Pouch
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Dorsal Part - Sup. Parathyroid Glands
Ventral Part - Ultimobranchial Body (fuses with Thyroid Glands) Portions of Lat. Thyroid Gland? |
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Fifth Pharyngeal Pouch
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Usually considered part of Fourth Ultimobranchial Body
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First Branchial Groove (Pharyngeal Cleft)
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Only one to persist: forms external acoustic meatus
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Second to Fourth Branchial Grooves/Pharyngeal Grooves
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Temporarily exist as Common Cervical Sinus which usually disappears. (may be found as "Branchial sinus" alone or with Branchial Fistula)
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Branchial Membranes: definition and derivatives
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temporary structures that appear where epithelia of branchial groove and pharyngeal pouch approach each other. Only the FIRST pair of branchial membranes contribute to adult structures; they give rise to the Tympanic Membrane
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Development of Thyroid Gland: Variations and Malformation
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1. Pyramidal Lobes/Persistant Thyroglossal Ducts
3. Thyroglossal Duct Cysts & Sinuses 5. Ectopic Thyroid Gland |
