Every named space in the reference with its boundaries, contents, and communications, grouped by body region.
Space and Compartment Sheet
62 rows · AnatoMemory · sample of the first 3 rows of each section (13 of 62)
Thorax
Thorax - Space and Compartment Sheet. Every named space in the reference with its boundaries, contents, and communications, grouped by body region.
Space
Boundaries
Contents
Communications
Aortic hiatus
Median arcuate ligament in front, diaphragmatic crura at the sides and vertebral column behind, conventionally near T12
Aorta and thoracic duct; an azygos-system vein may also pass through this region
Posterior mediastinum to the upper retroperitoneal region
Aortic sinuses (of Valsalva)
The root wall and corresponding cusp enclose each sinus, extending upward to the sinotubular junction
Blood-filled spaces, usually with right and left coronary ostia in their named sinuses
Continuous with the aortic lumen; the coronary ostia lead into the coronary arteries
Cardiac auscultation areas
Common anterior chest landmarks extend from the second parasternal interspaces to the lower sternal border and cardiac apex
These are listening sites over chest-wall tissues, not a distinct anatomical cavity
Cardiac vibrations travel through blood and surrounding tissues; their audible distribution depends on the sound and anatomy
Abdomen
Abdomen - Space and Compartment Sheet. Every named space in the reference with its boundaries, contents, and communications, grouped by body region.
Space
Boundaries
Contents
Communications
Bare area of the liver
Coronary peritoneal reflections bound the region superiorly and inferiorly; they converge laterally at the right triangular ligament, with the caval region medially.
Connective tissue, small vessels and lymphatic channels occupy the liver–diaphragm interface; there is no intervening normal peritoneal cavity.
Continuous with neighboring retroperitoneal connective tissue, including the right suprarenal region; peritoneal recesses lie alongside its reflected margins.
Calot's triangle
Hepatocystic definition: common hepatic duct medially, cystic duct inferolaterally and inferior liver surface superiorly. Historical definition substitutes the cystic artery for the liver boundary.
Cystic artery and lymph node, lymphatics, fat and connective tissue; hepatic arterial or ductal variants may traverse the area.
Situated beside the gallbladder neck and upper extrahepatic biliary tract, adjacent to the hepatoduodenal ligament and liver hilum.
Epiploic foramen
Anterior: hepatoduodenal ligament and portal triad. Posterior: peritoneum over the inferior vena cava. Superior: caudate liver. Inferior: superior duodenum.
A passage within the potential peritoneal cavity, normally containing only the thin fluid layer that lubricates its surfaces.
Connects the greater sac on the right with the vestibule of the lesser sac.
Pelvis
Pelvis - Space and Compartment Sheet. Every named space in the reference with its boundaries, contents, and communications, grouped by body region.
Space
Boundaries
Contents
Communications
Deep perineal pouch
Superior to the perineal membrane in the anterior perineum, between lateral pelvic fascial attachments and the pelvic-floor/sphincter region; no uniform sealed superior sheet is present.
Urethra and striated sphincter complex with genital neurovascular pathways; bulbourethral glands in males and vaginal/urethrovaginal structures in females. Transverse muscle anatomy varies.
Continuous with adjacent pelvic connective-tissue spaces; urethra, vagina where present, ducts and neurovascular structures traverse or integrate with its boundaries.
Ischioanal fossa
Medially bounded by levator ani and external sphincter; laterally by obturator internus fascia and ischial tuberosity. Skin forms the base, and the roof narrows where pelvic floor meets obturator fascia. An anterior recess lies above the perineal membrane.
Fat, connective tissue, lymphatics and inferior rectal neurovascular branches; cutaneous sacral branches may also pass through. Pudendal nerve and internal pudendal vessels occupy the lateral-wall canal.
Extends forward above the perineal membrane and communicates posteriorly through the deep postanal region. The pudendal route connects the lateral wall with the lesser-sciatic-foramen region.
Perineum
Outlined by the pubic symphysis, ischiopubic rami, ischial tuberosities, sacrotuberous ligaments and coccyx; bounded superiorly by the pelvic diaphragm.
Urogenital triangle: genital roots, urethra, perineal muscles and vagina where present. Anal triangle: anal outlet, sphincter complex, ischioanal fat and lateral pudendal canals.
Communicates with pelvic outlet spaces and, by the lesser sciatic route, the gluteal region. Superficial fascial planes continue toward the lower abdominal wall.
Back
Back - Space and Compartment Sheet. Every named space in the reference with its boundaries, contents, and communications, grouped by body region.
Space
Boundaries
Contents
Communications
Lumbar cistern
Extends from below the conus, usually around L1–L2, to the end of the arachnoid-lined dural sac near S2; these are approximate adult vertebral levels
Cerebrospinal fluid, descending cauda equina roots and the filum terminale internum
Continuous upward with the spinal and cranial subarachnoid space; arachnoid and dura separate it from the epidural space
Head & neck
Head & neck - Space and Compartment Sheet. Every named space in the reference with its boundaries, contents, and communications, grouped by body region.
Space
Boundaries
Contents
Communications
Carotid sinus
Usually distal common/proximal internal carotid wall near the upper thyroid-cartilage level. Both bifurcation height and the extent of the sinus vary.
An arterial lumen surrounded by a wall specialized for stretch sensing, with abundant sensory endings toward the outer wall. The carotid body is a nearby separate structure.
Sensory axons primarily enter the carotid sinus branch of IX and project to the solitary nucleus, where cardiovascular reflex circuits integrate them with other inputs.
Central sulcus
Precentral gyrus on the anterior side and postcentral gyrus on the posterior side; the sulcus descends forward from near the superomedial hemispheric border
Opposing cortical banks, pial vessels and the overlying subarachnoid CSF space
Extends onto the medial surface within the paracentral region and usually ends above the lateral sulcus; precentral and postcentral sulci lie nearby
Cerebral aqueduct
Lined by ependyma within the midbrain and surrounded by periaqueductal gray, between the tectal and tegmental regions
Cerebrospinal fluid; no choroid plexus
Third ventricle rostrally to fourth ventricle caudally
Built from the space records of the AnatoMemory reference library.
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