Maternal Anatomy Flashcards
Langer lines a low transverse incision like
Pfannenstiel or bikini cut
Superficial fatty layer
Continues onto the perineum to provide fatty substance to the mons pubis and labia majora and then blend with the fat of the ischioanal fossa
Camper fascia
Deeper membranous layer
Scarpa fascia
Scarpa fascia continues inferiorly onto the perineum as
Colles fascia
Fibrous aponeurosis of the muscles form the primary fascia of the anterior abdominal wall which fuse in the midline as
Linea alba
Abnormally wide separation may reflect
Diastasis recti or hernia
Rectus sheath
Construction of this varies above and below a boundary called
Arcuate line
Rectus sheath
Invest the rectus abdominis bellies on both the dorsal and ventral surfaces
Cephalad
Rectus sheath
Lie ventral and superficial to the rectus abdominis muscle
Caudal
Supplies the skin and subcutaneous layers
Femoral artery
Femoral artery branches out to the
Superficial epigastric
Superficial circumflex iliac
Superficial external pudendal arteries
Supplies the muscles and fascia
External iliac vessels
External iliac vessels branches out to the
Inferior deep epigastric vessels
Deep circumflex iliac vessels
Lacerated during Maynard incision for CS delivery
Inferior epigastric artery
Hasselbach triangle
Lateral - inferior epigastric vessels
Inferiorly - inguinal ligament
Medially - lateral border of the rectus muscle
Hernias direct
Hasselbach triangle
Hernias indirect
Deep inguinal ring lateral to the hasselbach triangle
Innervation
Anterior abdominal wall is innervated by the
Intercostal (T7-11)
Sub costal (T12)
Illiohypogastric and illioingunal (L1)
Innervation
Provide sensation to the skin over the suprapubic area
Illiohyphogastric nerve
Innervation
Supplies the skin of the mons pubis, upper labia majora and medial upper thigh
Illioingunal nerve
Innervation
Level of the umbilicus
T10 dermatome
Includes all structure visible externally from the symphysis pubis to the perineal body.
Pudenda or vulva
Fat filled cushion overlying the symphysis pubis covered by curly hair after puberty that form the escutcheon
Mons pubis/ mons veneris
Mons pubis shaped in men and women
Triangle - F
Diamond - M
Homologous with the male scrotum
Labia majora
Labia majora
Posteriorly
Form posterior commisure
Labia majora
Abundant
Apocrine
Eccrine
Sebaceous gland
Labia majora
Supplies with a rich venous plexus which commonly develops
Varicosities during pregnancy
Thin tissue fold that lies medial to each labia majora
Labia minora
Labia minora
Homologous in male
Ventral shaft of penis
Labia minora
Superiorly and divides into 2 lamellae
Lower: clitoris
Upper: prepuce
Labia minora
Inferiorly
Fourchette
Labia minora
Size
Width - 1-5 cm
Length - 2-10cm
Labia minora
Composed of connective tissue with
Nemerous vessels
Elastin fibers
Very few smooth muscle fibers
Labia minora
Epithelium outer
Thinly keratinized stratified squamous
Labia minora
Inner epithelium
Same as outer up to the hart line which is covered by non keratinized squamous epithelium
Labia minora
Lacks of
Hair follicle
Eccrine
Apocrine
Principal female erogenous organ
Clitoris
Clitoris
Homologous in male
Penis
Clitoris
Size
2 cm in length
Clitoris
Composed of
Glans - stratified squamous epi
Corpus - contain 2 corpora cavernosa
2 crura
From embryonic urogenital membrane
Vestibule
Vestibule
Almond shaped area enclosed by
Lateral: hart line
Medial: external surface of the hymen
Anterior: clitoral frenulum
Posterior: Fourchette
Vestibule
Openings
Urethra
Vagina
2 bartholin glands
Scene glands
Vestibule
Posterior portion between the Fourchette and vaginal opening is called
Fossa navicularis
Usually observed in nulliparas
Membrane of varying thickness that surrounds the vaginal opening more or less completely
Hymen
Hymen
Epithelium
Non keratinized stratified squamous epithelium
Rare malformation in which the vaginal orifice is occluded
Imferporate hymen