DEVELOPMENT (ARCHES) Flashcards
anomalous development of external acoustic meatus?
problem with 1st pharyngeal cleft
Difference between 1st arch and 2nd arch?
1st arch: incus & malleus
2nd arch: stapes
Meckel’s cartilage makes what?
malleus & Incus (1st Branchial Arch)
The mandible is ________ to Meckel’s cartilage in development?
Lateral
Hyoid bone develops from which arch?
2nd arch & 3rd arch
Buccinator muscle develops from which arch?
2nd Arch
Describe Reichert’s cartilage ?
2nd arch, makes stapes bone, styloid process, stylohyoid, CN VII
Inferior parathyroid is from ?
3rd Pouch
Thymus gland is from ?
3rd & 4th brachial pouches
What develops from Rathke’s pouch (ectoderm)?
Anterior pituitary (adenohypophysis)
Philtrum of the lip is formed from
medial nasal processes & maxiallary processes
unilateral cleft lip is caubsed by the ?
maxillary prominences on the affected side joining with the merged medial nasal prominence
What forms the palate?
Fusion of Intermaxillary & Palatal Shelves
Macrostomia (large mouth) is failure of fusion of ?
maxillary & mandibular process
What structure in brachial arches failed if baby has bifurcated tongue?
Tuberculum impar
Hypoglossal nerve (CN 12) comes from ?
occipital somites (not pharyngeal arches)
Which one comes from the upper layer of the neural tube?
Ascending Sensory Pathway
Describe ascending tracts?
the pathways by which sensory information from the peripheral nerves is transmitted to cerebral cortex
What does Ascending tract consists of?
consist of dorsal colum-medial lemniscal pathway (fine touch/ proprioception) & anterior / lateral spinothalamic tract
Origin of the pons & medulla
Rhombencephalon (hindbrain, includes: medulla, pons, & cerebellum)
What are the 3 primary vesicles?
Prosencephalon + Mesencephalon + Rhombencephalon
What is the pons derived from?
Metencephalon (pons & cerebellum)
What are the 5 secondary vesicles?
Telencephalon + Diencephalon + Mesencephalon + Metencephalon + Myelencephalon
