2.2 - development of H&N (derivatives) Flashcards
what are the cranial nerves associated to the 6 arches?
nerves 5, 7, 9, 10 1 = trigeminal (V) 2 = facial (VII) 3 = glossopharyngeal (IX) 4 + 6 = vagus (X)
what are the muscles (and sensory) derived from the 1st arch?
muscles of mastication mylohyoid anterior belly of digastric tensor tympani tensor veli palatine
what are the skeletal derivatives of the 1st arch?
maxillae and zygomatic bones
Meckel’s cartilage:
future mandible, malleus and incus
how does Meckel’s cartilage link to mandible?
Meckel’s cartilage provides template for mandible to form (via intramembranous ossification)
what are the muscles (and sensory) derived from the 2nd arch?
muscles of facial expression stapedius stylohyoid posterior belly of digastric special SENSORY (taste) - anterior 2/3 of tongue
what are the skeletal elements derived from the 2nd arch?
Reichert's cartilage: superior part of hyoid stapes styloid process stylohyoid ligament
what are the muscles associated to the 3rd arch?
stylopharyngeus (muscle of the pharynx)
SENSORY to posterior 1/3rd tongue, upper part pharynx
what are the skeletal elements linked to the 3rd arch?
inferior part of body of hyoid
what are the skeletal elements linked to the 3rd + 4th arches?
epiglottis
what are the muscles associated to the 4th-6th arches?
constrictor muscles of pharynx and muscles of soft palate (levator veli palatine)
muscles of the larynx
striated muscle of upper oesophagus
SENSORY to linings of lower pharynx + ALL larynx
what are the skeletal structures associated to 4th-6th arches?
cartilages of the larynx
what are the structural derivatives of 1st pharyngeal pouch?
pharyngotympanic (eustachian) tube and middle ear cavity
what are the structural derivatives of 2nd pharyngeal pouch?
palatine tonsil
what are the structural derivatives of 3rd pharyngeal pouch?
inferior parathyroid
thymus
what are the structural derivatives of 4th pharyngeal pouch?
superior parathyroid
C cells of thyroid
