Human Anatomy Diagrams

Openings into the Nasal Cavity Draining Paranasal Sinuses Lacrimal Duct and Auditory Tube

Posted on February 20, 2026 by anatomy

Several important structures open into the nasal cavity, allowing drainage and airflow regulation. The maxillary, frontal, and anterior ethmoidal sinuses drain into the middle meatus, while the posterior ethmoidal sinuses open into the superior meatus. The nasolacrimal duct drains tears View Diagram Openings into the Nasal Cavity Draining Paranasal Sinuses Lacrimal Duct and Auditory Tube→

Structures of the Metacarpophalangeal Joint

Posted on February 19, 2026 by anatomy

The metacarpophalangeal joints connect the metacarpals to the proximal phalanges. They are condyloid synovial joints allowing flexion, extension, abduction, adduction, and circumduction. Collateral ligaments stabilize the joints, while the joint capsules and synovial fluid facilitate smooth movement. These joints are View Diagram Structures of the Metacarpophalangeal Joint→

Lymph Nodes of the Head and Neck

Posted on February 18, 2026 by anatomy

Lymph nodes of the head and neck are arranged in superficial and deep groups. Superficial nodes include submental, submandibular, parotid, mastoid, and occipital nodes, which drain specific regions of the scalp and face. Deep cervical nodes lie along the internal View Diagram Lymph Nodes of the Head and Neck→

Origin of the Blood Supply to the Upper Limb Subclavian Vessels

Posted on February 17, 2026 by anatomy

The subclavian vessels originate from the aortic arch on the left and brachiocephalic artery on the right. They give rise to the vertebral, internal thoracic, thyrocervical, and costocervical arteries, supplying the upper limb, thorax, and head. Understanding their origin, course, View Diagram Origin of the Blood Supply to the Upper Limb Subclavian Vessels→

Borders of the Triangular Space

Posted on February 16, 2026 by anatomy

The triangular space is an anatomical region in the posterior shoulder bordered by the teres minor, teres major, and long head of the triceps. It contains the circumflex scapular artery and provides a pathway for blood supply to the scapular View Diagram Borders of the Triangular Space→

Bony Landmarks of the Pubis

Posted on February 14, 2026 by anatomy

The pubis forms the anterior portion of the hip bone and includes the pubic body, superior and inferior pubic rami, and the pubic symphysis, where the two sides meet at the midline. Its bony surfaces provide attachment points for muscles View Diagram Bony Landmarks of the Pubis→

Borders of the Pelvic Outlet

Posted on February 13, 2026 by anatomy

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→

Bony Landmarks of the Ilium Wing ASIS PSIS Hip Bone.

Posted on February 12, 2026 by anatomy

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.→

Major Branches of the Coeliac Trunk

Posted on February 11, 2026 by anatomy

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→

Anatomy of the Vulva Labia Clitoris Mons Pubis

Posted on February 10, 2026 by anatomy

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 Sinuses and Coronary Arteries

Posted on February 9, 2026 by anatomy

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→

Bicornate Uterus Development of the Reproductive System

Posted on February 8, 2026 by anatomy

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 Down and Out Position

Posted on February 7, 2026 by anatomy

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→

Components of the Basal Ganglia

Posted on February 6, 2026 by anatomy

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

Posted on February 5, 2026 by anatomy

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→

Surface Anatomy of the Eyelids Uppper Lower

Posted on February 4, 2026 by anatomy

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→

Cutaneous Innervation of the Median Nerve Skin of the Hand

Posted on February 3, 2026 by anatomy

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 Olfactory Nasopalatine and Nasociliary Nerves

Posted on February 2, 2026 by anatomy

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→

Bennetts Fracture of the 1st Metacarpal

Posted on February 1, 2026 by anatomy

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→

Borders of the Femoral Canal

Posted on January 31, 2026 by anatomy

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→