Trimester

Number of Weeks

Keratinized Stratified squamous epithelial tissue of Skin

Non-Keratinized Epithelial tissue of mucous

Muscular Membrane

Lip glands

Height

Width

M ± SD

II

18

26.2 ± 5.0

51 ± 12.3

567.4 ± 31.1

73.2 ± 1.1

129.4 ± 19.1