Met anatomy Flashcards
External oblique fibres
Inferomedially
Internal oblique fibres
Superomedially
Rectus sheath
Encloses rectus abdominus
Made up of the aponeuroses of the external and internal obliques and the transversus abdominus
Where is the arcuate line found?
Midway between the umbilicus and pubic symphysis
Above the arcuate line
Rectus sheath either side of rectus abdominus
Epigastric vessels within rectus sheath
Below arcuate line
Rectus sheath only anterior to rectus abdominus
Rectus abdominus in contact with transversalis fascia
Epigastric vessels outside rectus sheath
Structures passing under inguinal ligament
Lateral –> medial
Femoral nerve
Femoral artery
Femoral vein
Femoral canal (lymphatics)
Spermatic cord layers
Internal spermatic fascia Cremaster muscle External spermatic fascia Dartos muscle Skin
Inguinal triangle borders
Hesselbach’ triangle
Medial = lateral border of rectus abdominus Lateral = inferior epigastric vessels Inferior = inguinal ligament
Conjoint tendon
Fusion of the aponeuroses of the internal oblique and transverse abdominus
Midpoint of inguinal ligament
Halfway between ASIS and PT
Deep inguinal ring
Mid-inguinal point
Halfway between ASIS and PS
Femoral artery
Pituitary blood supply
Superior hypophyseal artery from ophthalmic artery
Inferior hypophyseal artery from cavernous ICA
Hypophyseal veins –> cavernous sinus
Cavernous sinus contents
ICA, CN III, IV, V1, V2, VI
What passes through SOF
CN III, IV, V1, VI
Pringle manoeuvre
Clamping of duodenal end of lesser omentum
Restricts blood flow –> liver
Normal portal and IVC pressures
Portal = 9mmHg IVC = 2-6mmHg
Pressure difference for portal hypertension
Portal - IVC >10mmmHg
Anal canal above pectinate/dentate line
Endoderm origin
Superior rectal artery artery and vein (portal circulation)
Inferior hypogastric plexus
Columnar epithelium
Lymph –> internal iliac nodes
Haemorrhoids here are internal and painless
Anal canal below pectinate/dentate line
Ectoderm origin Inferior rectal artery and vein (systemic circulation) Inferior rectal nerve (pudendal) Stratified squamous epithelium Lymph --> inguinal nodes Haemorrhoids are external and painful
Which systemic veins does the umbilical vein connect to?
Superior = intercostal veins Inferior = inferior epigastric veins
Grey-Turner sign
Flank bruising
Sign of retroperitoneal haemorrhage
Rate of bile secretion
40ml/hour
How much bile can the gallbladder hold?
50ml
Referred pain of cholecystitis
Right flank and shoulder
Blood supply to gallbladder
Cystic artery from right hepatic artery
Calot’s triangle
Liver
Cystic duct
Common hepatic duct
Where is the heptorenal recess found
Between liver and right kidney
Psoas major attachments
Vertebral bodies of T12-L5
–> lesser trochanter
Quadratus lumborum attachments
Transverse processes of L1-5
–> iliac crests
Gerota’s fascia
Renal fascia surrounding kidneys, adrenal and perirenal fat
Renal plexus roots
T10-12
Renal referred pain
Flanks and small of the back
Ureter nerve supply
T11-L1/2
Loin pain = iliohypogastric and ilioinguinal
Groin pain = genitofemoral
What connect the bladder to the umbilicus?
Medial umbilical ligament
Remnant of the urachus
Layers of the bladder
Adventitia
Detrusor
Transitional epithelium
Trigone
Triangle formed by the ureteric orifices and urethral orifice
Smooth walls
More prone to infection
Mesonephric ducts
= Wollfian ducts
Form male reproductive tract
Degenerate in females (except the lower portion)
Paramesonephric ducts
= Mullerian ducts
Form oviduct in females
Degenerate in males
3 embryonic kidneys
Pronephric
Mesonephric
Metanephric
Metanephric kidney formation
Ureteric bud grows out of the mesonephric duct
Joins the metanephric bud (mass of mesenchymal tissue)
Ureteric bud goes on to form…
Ureter,
Renal pelvis
Major and minor calyces
Collecting ducts
Metanephric bud goes on to form…
Renal corpuscle
PCT
Loop of Henle
DCT
Embryonic vs final level of the kidney
Embryonic = S1 Final = T12
Ectopic kidney
= failure for kidney to ascend
Kidney agenesis
Failure of kidneys to form
Failure off ureteric bud to grow or to come into contact with metanephric bud
Consequences of bilateral kidney agenesis
No formation of amniotic fluid = oligohydraminos
Lungs do not develop
Club foot
Death
Pancake vs horseshoe kidney
Pancake = both poles fused Horseshoe = one pole fused
Polycystic kidney disease
Kidneys develop fluid filled cysts
Autosomal dominant = polyctsin (cilia) mutation
Autosomal eccessive = fibrocystin mutation
Parotid gland opening
Opposite second upper molar
Parotid gland innervation
CN IX
Sublingual gland opening
Plica sublingualis
Sublingual gland innervation
CN VII (chords tympani)
Submandibular gland opening
Either side of the frenulum
Submandibular gland innervation
CN VII (chords tympani)
Muscles of mastication
Temporalis
Masseter
Medial pterygoid
Lateral pterygoid
Muscles of mastication innervation
V3 of CN V
Tongue innervation
CN XII
Muscles of the soft palate innervation
CN X (pharyngeal nerve) Nerve to tensor veli palatini - CN V3
Laryngeal closure nerve
Recurrent laryngeal
Oesophagus nerve supply
Upper = recurrent laryngeal Lower = vagus
Extent of oesophagus
C6 –> T10
UOS
Cricopharyngeus = skeletal muscle
Where can objects lodge in the oesophagus
UOS
Aortic narrowing
LOS
Spermatic cord contents
Testicular artery and vein Cremasteric artery and vein Artery to vas deferens Genital branch of genitofemoral nerve Vas deferens Lymph vessels Processus vaginalis Autonomic nerves
What does the genital branch of the genitofemoral branch innervate?
Cremaster muscle
Scrotal skin
Mons pubis and labia majora
Lesser omentum
Liver (around portal hepatis) –> lesser curvature of the stomach
Hepatogastric and hepatoduodenal ligaments
Porta hepatis runs in free border
Visceral abdominal pain
Foregut = T6-9 = epigastric Midgut = T8-12 = umbilical Hindgut = T12-L2 = suprapubic
Where is pain felt in diverticular disease
LIF
Where is volvulus most common?
Caecum and sigmoid colon
Splenic artery branches
Short gastric
Left gastroepiploic
Hepatic artery proper branches
Right gastric
Left hepatic
Right hepatic
–> cystic
Gastroduodenal artery branches
Right gastroepiploic
Superior pancreaticoduodenal
Vasa recta in jejunum vs ileum
Longer and fewer in jejunum
More and shorter in ileum
SMA branches
Middle colic
Right colic
Jejunal and ill
Iliocolic
IMA branches
Left colic
Sigmoidal
Superior rectal
Peritoneal covering of the rectum
1st 1/3 = covered anteriorly and laterally
2nd 1/3 = covered anteriorly
3rd 1/3 = not covered
Rectum blood supply
Superior rectal = from IMA
Middle rectal = from internal iliac
Inferior rectal = from pudendal
Internal anal sphincter innervation
Parasympathetic via pelvic splanchnic nerves
External anal sphincter innervation
Inferior rectal nerve
Haemorrhoids
Engorged veins within the anal cushions
Extent of the thyroid
Oblique line of thyroid cartilage
–> 4th/5th tracheal ring
Thyroid arterial supply
Superior thyroid artery from ECA
Inferior thyroid artery from thyrocervical trunk (SCA)
Thyroid ima artery from brachiocephalic trunk
Thyroid venous drainage
Superior thyroid vein –> IJV
Middle thyroid vein –> IVJ
Inferior thyroid vein –> brachiocephalic vein
Right vs left adrenal gland shapes
Right = pyramidal Left = crescent shaped
Adrenal arterial supply
Superior = from inferior phrenic Middle = from aorta Inferior = from renal artery
Adrenal venous drainage
- -> IVC on right
- -> renal vein on left
Pancreas uncinate process
Projects off from the head
SMA and SMV pass over it
Pancreas blood supply
Pancreatic branches of the splenic artery Superior pancreaticoduodenal (gastroduodenal) Inferior pancreaticoduodenal (SMA)
Caudate vs quadrate lobes
Quadrate = anterior Caudate = posterior
Nutmeg liver
Red spots on surface
Caused by congestive heart failure
Abdominal aorta branches
T12 = coeliac trunk L1 = SMA L1/2 = renal arteries L2 = gonadal arteries L3 = IMA L4 = bifurcation
IVC course in the abdomen
Common iliac veins join at L5
Receive blood from renal veins, suprarenal veins and gonadal veins
Passes through diaphragm at T8
Renal artery divisions
- -> segmental arteries
- -> interloper arteries
- -> arcuate arteries
- -> interlobular arteries
Course of the ureter
Out of kidney at hilum Travels over psoas major Pass over common iliac bifurcation at the pelvic brim Pass laterally around the pelvis Turn medially to empty into the bladder
3 ureteric narrowing points
PUJ
Pelvic brim
CUJ
Level of adrenal glands
T12
Ureters in relation in female arteries
Pass under ovarian arteries at pelvic brim
Pass under uterine arteries either side of the cervix