Biology 3

Question 1

Ectoderm Germ Layer

Answer 1

• ne³ (neural, epidermis, eye, ear)
• outer layer of the embryo, and it forms from the embryo’s epiblast.
• The ectoderm develops into the surface ectoderm, neural crest, and the neural tube.
• The surface ectoderm develops into: epidermis, hair, nails, lens of the eye, sebaceous glands, cornea, tooth enamel, the epithelium of the mouth and nose.

• The neural crest of the ectoderm develops into: peripheral nervous system, adrenal medulla, melanocytes, facial cartilage, dentin of teeth.*
• The neural tube of the ectoderm develops into: brain, spinal cord, posterior pituitary, motor neurons, retina.*
• Note: The anterior pituitary develops from the ectodermal tissue of Rathke’s pouch.*

Question 2

Endoderm

Answer 2

• “dllp” (digestive, liver, lungs, pancreas)
• the stomach, the colon, the liver, the pancreas, the urinary bladder, the epithelial parts of trachea, the lungs, the pharynx, the thyroid, the parathyroid, and the intestines.

Question 3

Mesoderm Germ Layer

Answer 3

• mgck: muscles, gastro, circulatory, kidney
• muscle (smooth and striated), bone, cartilage, connective tissue, adipose tissue, circulatory system, lymphatic system, dermis, genitourinary system, serous membranes, and notochord.