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  2. Vestibule - Wikipedia

    en.wikipedia.org/wiki/Vestibule

    In general, vestibule is a small space or cavity at the beginning of a canal. The vulval vestibule is a part of the vulva between the labia minora into which the urinary meatus (urethral opening) and the vaginal opening are situated

  3. Cavitation (embryology) - Wikipedia

    en.wikipedia.org/wiki/Cavitation_(embryology)

    This draws fluid in through osmosis causing a cavity to form inside the morula, and to increase in size. [2] The cavity is the blastocoel. Following the formation of the blastocoel, the inner cell mass positions itself in one portion of the cavity, while the rest of the cavity is filled with fluid, and lined with trophoblasts. [1] [3]

  4. Human mouth - Wikipedia

    en.wikipedia.org/wiki/Human_mouth

    The mouth consists of two regions: the vestibule and the oral cavity proper. The vestibule is the area between the teeth, lips and cheeks. [3] The oral cavity is bounded at the sides and in front by the alveolar process (containing the teeth) and at the back by the isthmus of the fauces. Its roof is formed by the hard palate.

  5. Face and neck development of the human embryo - Wikipedia

    en.wikipedia.org/wiki/Face_and_neck_development...

    These new structures grow dorsocaudally in front of the forming brain. In the beginning, the nasal sacs are separated from the oral cavity by the oronasal membrane. This membrane disappears in the seventh week leaving a connection between the nasal cavities and the oral cavity, called the primitive choanae. Later, when the development of the ...

  6. Body cavity - Wikipedia

    en.wikipedia.org/wiki/Body_cavity

    The cranial cavity is a large, bean-shaped cavity filling most of the upper skull where the brain is located. The spinal cavity is the very narrow, thread-like cavity running from the cranial cavity down the entire length of the spinal cord. In the dorsal cavity, the cranial cavity houses the brain, and the spinal cavity encloses the spinal ...

  7. Human tooth development - Wikipedia

    en.wikipedia.org/wiki/Human_tooth_development

    Primary dentition starts on the arrival of the mandibular central incisors, usually at eight months, and lasts until the first permanent molars appear in the mouth, usually at six years. [44] The primary teeth typically erupt in the following order: (1) central incisor, (2) lateral incisor, (3) first molar, (4) canine, and (5) second molar. [45]

  8. Inner ear - Wikipedia

    en.wikipedia.org/wiki/Inner_ear

    Beginning in the fifth week of development, the auditory vesicle also gives rise to the cochlear duct, which contains the spiral organ of Corti and the endolymph that accumulates in the membranous labyrinth. [6] The vestibular wall will separate the cochlear duct from the perilymphatic scala vestibuli, a cavity inside the

  9. Amniotic sac - Wikipedia

    en.wikipedia.org/wiki/Amniotic_sac

    Amniotic cavity in human embryo 1.3 mm. long. The amniotic cavity is the closed sac between the embryo and the amnion, containing the amniotic fluid. The amniotic cavity is formed by the fusion of the parts of the amniotic fold, which first makes its appearance at the cephalic extremity and subsequently at the caudal end and sides of the embryo ...

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