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Structure of a Vein Wall Diagram
The Structure of a Vein Wall diagram layers out the typical three-part construction: a thin tunica intima with endothelium for smooth flow, a thicker tunica media with some smooth muscle…
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Course of the Long Thoracic Nerve Diagram
The long thoracic nerve (C5-C7) descends superficially on serratus anterior, supplying it for scapular protraction/rotation. Injury causes winged scapula and difficulty raising arm overhead.
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Renin Aldosterone Angiotensin
Renin-angiotensin-aldosterone system activates on low renal perfusion sensed by juxtaglomerular cells releasing renin converting angiotensinogen to angiotensin I, ACE in lungs to II potent vasoconstrictor raising pressure, stimulating aldosterone from…
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Overview of Parasympathetic Innervation Diagram
Parasympathetic innervation originates from cranial nerves (III, VII, IX, X) and sacral S2-S4. Preganglionic fibers synapse in terminal ganglia near targets for rest and digest functions: pupil constriction, salivation, lacrimation,…
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Origin of the Superficial Veins of the Upper Limb Diagram
Superficial upper limb veins originate as dorsal venous arch (cephalic lateral to basilic medial), draining to median cubital at elbow, then axillary/subclavian. Theyre key for IV access.
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Development of the Palate Diagram
The development of the palate begins with primary palate formation from medial nasal prominences (intermaxillary segment) anteriorly, followed by secondary palate from lateral palatal shelves of maxillary prominences. Shelves grow…
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Course of the Superior Thoracic Artery Diagram
This Course of the Superior Thoracic Artery diagram traces this small branch from the first part of the subclavian artery, descending to supply the upper intercostal spaces, chest wall muscles,…
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Posterior Interosseous Artery Radial Nerve Supintor Diagram
The posterior interosseous artery arises from common interosseous (from ulnar), runs with posterior interosseous nerve through supinator, supplies posterior forearm extensors. The supinator muscle wraps radius, innervated by deep radial…
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Borders and Contents of the Adductor Canal Diagram
The Borders and Contents of the Adductor Canal diagram defines this subsartorial tunnel from apex of femoral triangle to adductor hiatus: roof (sartorius), anterolateral (vastus medialis), posteromedial (adductors longus/magnus). Contents…
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Laparoscopic Cholecystectomy Diagram
This Laparoscopic Cholecystectomy diagram shows the key steps of gallbladder removal using small incisions and a camera. It highlights where the trocars go, the tools in action, and important structures…
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Recurrent Branch of Median Nerve Diagram
Recurrent branch of median nerve arises distal to carpal tunnel, loops around flexor pollicis brevis to supply thenar muscles (abductor pollicis brevis, opponens pollicis, superficial flexor pollicis brevis head). Its…
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Development of the Bladder Ureter Mesonephric Duct Diagram
The Development of the Bladder Ureter Mesonephric Duct diagram traces embryonic stages where the mesonephric (Wolffian) duct gives rise to the ureteric bud, which induces metanephric blastema for kidney formation…
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Overview of the Anatomical Distribution of the Trigeminal Nerve and its Terminal Branches Diagram
Trigeminal nerve distribution covers face via ophthalmic (V1: forehead, eye, nose), maxillary (V2: cheek, upper lip/teeth, maxillary sinus), mandibular (V3: lower jaw, lower teeth, anterior tongue, muscles of mastication). Terminal…
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Subdivisions of the Posterior Triangle of the Neck Subclavian Triangle and Occipital Triangle Diagram
Posterior triangle subdivisions: occipital triangle (above inferior omohyoid) contains accessory nerve, transverse cervical vessels; subclavian (below) contains brachial plexus trunks, subclavian vessels.
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Neurulation Development of the Central Nervous System Diagram
Neurulation forms the CNS from neural plate (ectoderm thickening) folding into neural groove, then neural tube by fusion of neural folds. Anterior neuropore closes first (day 25), posterior last (day…
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The Spinothalamic Tracts Ascending Sensory Diagram
The spinothalamic tracts carry pain, temperature, and crude touch from the body: lateral for pain/temp, anterior for touch/pressure. Fibers cross in the spinal cord shortly after entry, ascend contralaterally to…
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Course of the Lateral Cutaneous Nerve of the Forearm Diagram
Lateral cutaneous nerve of forearm (from musculocutaneous) supplies lateral forearm skin, running with cephalic vein. Its sensory only.
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Anatomical Course of the Inferior Alveolar Nerve and Lingual Nerve Diagram
Inferior alveolar nerve (V3 branch) enters mandibular foramen, runs in canal supplying lower teeth, exits as mental nerve for chin/lower lip; lingual nerve (also V3) supplies anterior tongue sensation/floor of…
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Anatomy of the Nerves of the Dorsum of the Foot Superficial and Deep Fibular Nerves Diagram
Nerves of dorsum foot include superficial fibular (sensory to dorsum except first webspace), deep fibular (first webspace skin, extensor digitorum brevis), sural (lateral foot). They emerge from anterior/lateral leg compartments.
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Anatomical Course of the Common Fibular Nerve and its Terminal Branches Diagram
The common fibular (peroneal) nerve wraps around fibular neck (vulnerable to injury), divides into superficial (lateral compartment, peroneus longus/brevis) and deep (anterior compartment, tibialis anterior, extensors) branches. It supplies dorsiflexion,…