Devo 2 - Head & Neck

Front 1

Sensory ganglia of CN 5, 7, 9, 10

Back 1

Epipharyngeal placodes

Front 2

Oral cavity

Back 2

Pharyngeal arch 1, frontonasal prominence

Front 3

Anterior pituitary

Back 3

Rathke's pouch

Front 4

Sphenomandibular ligament

Back 4

Meckel's cartilage (arch #1)

Front 5

Malleus, incus

Back 5

Meckel's cartilage (arch #1)

Front 6

Stylohyoid ligament

Back 6

Reichart's cartilage (arch #2)

Front 7

Styloid process

Back 7

Reichart's cartilage (arch #2)

Front 8

Stapes

Back 8

Reichart's cartilage (arch #2)

Front 9

Body, lesser horns of hyoid b.

Back 9

Reichart's cartilage (Arch #2)

Front 10

Body, greater horns of hyoid b

Back 10

Arch #3 cartilage

Front 11

Laryngeal cartilages

Back 11

Arch #4,6 cartilage

Front 12

Facial bones

Back 12

Maxillary prominence of arch #1 (fibrous CT = neural crest cells)

Front 13

Mm. of mastication

Back 13

Arch #1 head mesoderm

Front 14

Digastric (ant belly)

Back 14

Arch #1 head mesoderm

Front 15

Mylohyoid m.

Back 15

Arch #1 head mesoderm

Front 16

Tensor tympani, tensor veli palatini

Back 16

Arch #1 head mesoderm

Front 17

Mm. of facial expression

Back 17

Arch #2 head mesoderm

Front 18

Stapedius m.

Back 18

Arch #2 head mesoderm

Front 19

Stylohyoid m.

Back 19

Arch #2 head mesoderm

Front 20

Digastric m. (post. belly)

Back 20

Arch #2 head mesoderm

Front 21

Stylopharyngeus

Back 21

Arch #3 head mesoderm

Front 22

Laryngeal mm.

Back 22

Arch #4/6 occipital myotomes (head mesoderm)

Front 23

Palatoglossus m.

Back 23

Arch #4/6 occipital myotomes (head mesoderm)

Front 24

Pharyngeal constrictors

Back 24

Arch #4/6 occipital myotomes (head mesoderm)

Front 25

Palatopharyngeus m.

Back 25

Arch #4/6 occipital myotomes (head mesoderm)

Front 26

Salpingopharyngeus m.

Back 26

Arch #4/6 occipital myotomes (head mesoderm)

Front 27

Levator veli palatini

Back 27

Arch #4/6 occipital myotomes (head mesoderm)

Front 28

External auditory meatus

Back 28

Pharyngeal groove #1

Front 29

Tongue (body)

Back 29

Lateral lingual swellings, tuberculum impar (pharyngeal arch #1)

Front 30

Tongue (root

Back 30

Cranial hypopharyngeal swelling (pharyngeal arch #3,4)

Front 31

Epiglottis

Back 31

Caudal hypopharyngeal swelling (pharyngeal arches 3,4)

Front 32

Mm. of tongue (extrinsic and intrinsic)

*except palatoglossus

Back 32

Occipital somites (Head mesoderm)

Front 33

Jaw

Back 33

Mandibular prominences

Front 34

Nose (lateral edges)

Back 34

Lateral nasal prominences (frontonasal prominence)

Front 35

Nose (bridge, tip)

Back 35

Medial nasal prominences (frontonasal prominence)

Front 36

Forehead

Back 36

Frontonasal prominence

Front 37

Nasolacrimal sac, duct

Back 37

Maxillary prominence, lateral nasal prominences, frontonasal prominence

Front 38

Philtrum, upper lip

Back 38

Surface ectoderm

Front 39

Cheek

Back 39

Maxillary, mandibular nasal prominences

Front 40

Nasal choanae

Back 40

Rupture of oronasal membrane

Front 41

Hard palate

Back 41

Primary palate (Medial nasal, maxillary prominences) +

Secondary palate (palatine processes, maxillary, palatine bb)

Front 42

Soft palate

Back 42

Extension of secondary palate (palatine processes, maxillary, palatine bb.)

Front 43

Salivary glands

Back 43

Oral ectoderm

Front 44

Thyroid glands

Back 44

Midline diverticulum

Front 45

Epithelial lining of auditory tube, middle ear cavity

Back 45

Pharyngeal pouch #1

Front 46

Epithelial lining of palatine tonsils

Back 46

Pharyngeal pouch #2

Front 47

Inferior parathyroid glands

Back 47

Pharyngeal pouch #3 (dorsal wings)

Front 48

Thymus gland

Back 48

Pharyngeal pouch #3 (ventral wings)

Front 49

Superior parathyroid glands

Back 49

Pharyngeal pouch #4

Front 50

C cells of thyroid gland

Back 50

Pharyngeal pouch #5