Table 2.

Overview of muscle presence classified per cranial nerve

Cranial nerve	Muscle	Present Fully	Partly	Not
III (Oculomotor)	Levator palpebrae superioris			x
	Superior rectus	x
	Medial rectus	x
	Inferior rectis	x
	Inferior oblique	x
IV (Trochlear)	Superior oblique	x
V (Trigeminal)	Masseter		x
	Temporal		x
	Medial pterygoid		x
	Lateral pterygoid		x
	Tensor veli palatini			n
	Mylohyoid	x
	Anterior belly of digastric	x
	Tensor tympani			n
VI (Abducens)	Lateral rectus	x
VII (Facial)	Posterior belly of digastric		x
	Stylohyoid	x
	Stapedius			n
	Occipitofrontalis muscle			n
	Temporoparietalis muscle			n
	Procerus muscle			n
	Nasalis muscle			n
	Depressor septi nasi muscle			n
	Orbicularis oculi muscle			n
	Corrugator supercilii muscle			n
	Depressor supercilii muscle			n
	Auricular muscles (anterior, superior and posterior)			n
	Orbicularis oris muscle			n
	Depressor anguli oris muscle			n
	Risorius			n
	Zygomaticus major muscle			n
	Zygomaticus minor muscle			n
	Levator labii superioris			n
	Levator labii superioris alaeque nasi muscle			n
	Depressor labii inferioris muscle			n
	Levator anguli oris			n
	Buccinator muscle			n
	Mentalis			n
IX (Glossopharyngeal)	Stylopharyngeus			n
X (Vagus)	Cricothyroid muscle			n
	Levator veli palatini muscle	x
	Salpingopharyngeus muscle			n
	Palatoglossus muscle			n
	Palatopharyngeus muscle			n
	Superior, middle and inferior pharyngeal constrictors			n
	Muscles of the larynx (speech)
XI (Accessory)	Sternocleidomastoid	x
	Trapezius		x
XII (Hypoglossal)	Genioglossus	x
	Hyoglossus	x
	Styloglossus		x
	Intrinsic tongue muscles			n
	Geniohyoid	x

Stage 23 human embryo (56–60 days of development), specimen number 950, has been used for this table. Note the differences in presence of muscles depending on the particular cranial nerve. Most muscles of cranial nerves III, IV, V, VI, XI and XII were present at this stage, whereas most muscles of cranial nerves VII and X were absent.