Embryo Viva

Question 1

chorionic cavity

Answer 1

The chorionic cavity contains the fluid in which the embryo floats.

Question 2

neurulation

Answer 2

event occurring during the fourth week of human gestation, converting the previously developed neural plate into the ectoderm covered neural tube that will eventually differentiate into the brain and spinal cord.

Question 3

pharyngeal arch 1 derivatives

Answer 3

maxilla, mandible, muscles of mastication, tensor muscles, mylohyoid, ant. belly of digastric

Question 4

pharyngeal arch 2 derivatives

Answer 4

stapes, styloid of temporal, lesser horn of hyoid bone, muscles of facial expresssion, post. belly of digastric

Question 5

pharyngeal arch 3 derivatives

Answer 5

greater horn of hyoid bone, stylopharyngeus muscle

Question 6

pharyngeal arch 4 derivatives

Answer 6

laryngeal cartilages, pharyngeal and laryngeal muscles

Question 7

pharyngeal arch 6 derivatives

Answer 7

unpaired cartilages of larynx, larynx muscle except cricothyroid

Question 8

formation of upper lip, lower lip and jaw

Answer 8

The clefts between the maxillary prominences and medial nasal prominences close as the maxillary and medial nasal prominences fuse to form the upper lip (Figure 4). The lower lip and jaw are formed from the fusion of the mandibular prominences.

Question 9

fate of fertilization

Answer 9

Once fertilization happens, the cell starts to divide and multiply within 24 hours in the fallopian tube. This detached multi-celled structure is called a zygote. Later, after 3-4 days it travels to the uterus and now we call it as an embryo.

Question 10

ectoderm derivatives

Answer 10

Surface Ectoderm Derivatives include epidermis, Adenohypophysis, Lens, Epithelial linings of the oral cavity, Sensory organs of the ear, Olfactory epithelium, Anal canal below the pectinate line, Parotid gland, Sweat glands, and mammary Glands.

Question 11

mesoderm derivates

Answer 11

Some of the mesoderm derivatives include the muscle (smooth, cardiac, and skeletal), the muscles of the tongue (occipital somites), the pharyngeal arches muscle (muscles of mastication, muscles of facial expressions), connective tissue, the dermis and subcutaneous layer of the skin, bone and cartilage, dura mater, the endothelium of blood vessels, red blood cells, white blood cells, microglia, the dentin of teeth, the kidneys, and the adrenal cortex.