The pelvic outlet is bordered anteriorly by the pubic arch, laterally by the ischial tuberosities, and posteriorly by the tip of the coccyx and the sacrotuberous ligaments. Together, these boundaries form a diamond-shaped opening that marks the lower limit of View Diagram Borders of the Pelvic Outlet
The ilium contains several key bony landmarks that help define the hip bone and provide attachment sites for muscles and ligaments. The wing, or ala, of the ilium forms the broad, flared superior portion and supports the iliac fossa on View Diagram Bony Landmarks of the Ilium Wing ASIS PSIS Hip Bone.
The major branches of the coeliac trunk include the left gastric artery, the splenic artery, and the common hepatic artery, each supplying crucial abdominal organs. The left gastric artery ascends to the lesser curvature of the stomach and sends branches View Diagram Major Branches of the Coeliac Trunk
The vulva encompasses all of the external female genital structures, including the mons pubis, labia majora, labia minora, clitoris, and surrounding soft tissues that frame the vaginal and urethral openings. The mons pubis forms a soft, fatty pad over the View Diagram Anatomy of the Vulva Labia Clitoris Mons Pubis
The aortic valve consists of three cuspsright, left, and posteriorwhich form small bulging spaces known as the aortic sinuses. These sinuses help maintain smooth blood flow and create eddies that prevent the cusps from sticking to the aortic wall. The View Diagram The Aortic Valve Sinuses and Coronary Arteries
A bicornuate uterus is a congenital uterine anomaly that forms when the two Müllerian ducts partially fail to fuse during embryologic development, creating a uterus with two upper cavities separated by a deep fundal indentation. While the lower portion of View Diagram Bicornate Uterus Development of the Reproductive System
Oculomotor nerve palsy produces the classic down and out eye position because the muscles normally controlled by the oculomotor nerve lose their function, leaving only the lateral rectus and superior oblique muscles unopposed. As a result, the affected eye drifts View Diagram Oculomotor Nerve Palsy Down and Out Position
The basal ganglia consist of interconnected deep brain nuclei including the caudate nucleus, putamen, globus pallidus, subthalamic nucleus, and substantia nigra. These structures work together to regulate voluntary movement, motor planning, and habit formation by modulating signals between the cerebral View Diagram Components of the Basal Ganglia
The superior, middle, and inferior cervical ganglia are sympathetic chain ganglia located in the neck and responsible for supplying sympathetic innervation to the head, neck, and upper thorax. The superior cervical ganglion is the largest and provides fibers to structures View Diagram The Superior Middle and Inferior Cervical Ganglia
The surface anatomy of the eyelids includes the upper and lower lids, which protect the eye and maintain the tear film. The upper eyelid is larger, more mobile, and contains the levator palpebrae superioris muscle that lifts it during opening, View Diagram Surface Anatomy of the Eyelids Uppper Lower
The median nerve supplies cutaneous innervation to parts of the hand, primarily the lateral three and a half digits on the palmar side and their corresponding nail beds. Sensory fibers travel through the carpal tunnel to reach the thumb, index View Diagram Cutaneous Innervation of the Median Nerve Skin of the Hand
Innervation of the nasal septum is shared among the olfactory, nasopalatine, and nasociliary nerves, which together provide sensory input and contribute to the sense of smell. The olfactory nerve occupies the superior portion of the septum, detecting airborne chemicals and View Diagram Innervation of the Nasal Septum Olfactory Nasopalatine and Nasociliary Nerves
A Bennetts fracture is a fracture-dislocation at the base of the first metacarpal bone where it meets the trapezium, usually caused by a sudden axial load through a flexed thumb, such as during a fall or high-impact grip. The break View Diagram Bennetts Fracture of the 1st Metacarpal
The femoral canal is a small, clinically important space within the femoral triangle and is bounded anteriorly by the inguinal ligament, posteriorly by the pectineal ligament, medially by the lacunar ligament, and laterally by the femoral vein. It contains lymphatic View Diagram Borders of the Femoral Canal
The distal humerus features several important bony landmarks, including the medial and lateral epicondyles, the trochlea, and the capitulum, all of which play key roles in elbow function. The epicondyles serve as attachment points for the forearms flexor and extensor View Diagram Distal Aspect of the Humerus Epicondyle Trochlea Capitulum
Posterior articulations of the ribs include the connections between the rib head and the bodies of the thoracic vertebrae, as well as the articulation between the rib tubercle and the transverse process. Each rib typically articulates with the superior and View Diagram Posterior Articulations of the Rib
The phrenic nerve provides the primary motor innervation to the diaphragm and is essential for normal respiratory function. Arising from spinal roots C3 to C5, it descends through the neck on the anterior surface of the scalene muscle before entering View Diagram Phrenic Nerve Motor Innervation to the Diaphragm
The posterior inferior cerebellar artery (PICA) usually arises from the vertebral artery and follows a complex course around the medulla and cerebellum. After branching off, it winds posteriorly to pass between cranial nerves and wraps around the inferior surface of View Diagram Posterior inferior cerebellar artery orgin and course
From an anterior view, the venous drainage of the heart is dominated by the great and small cardiac veins, which work in parallel with the coronary arteries. The great cardiac vein begins near the apex of the heart and ascends View Diagram Anterior View of the Venous Drainage of the Heart Small and Great Cardiac Veins
The submandibular ganglion is a small parasympathetic ganglion suspended from the lingual nerve beneath the mandible. Preganglionic fibers originating from the facial nerve synapse here before sending postganglionic fibers to the submandibular and sublingual salivary glands. These fibers stimulate saliva View Diagram The Submandibular Ganglion and Branches
