Depolarization in Sinus Rhythm
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Depolarization in Sinus Rhythm

Depolarization in sinus rhythm refers to the orderly spread ??? of electrical impulses through the heart that drives a normal heartbeat, starting from the sinoatrial node, the natural pacemaker located…
Lesser Occipital Nerve Course Diagram
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Lesser Occipital Nerve Course Diagram

The lesser occipital nerve (C2 from cervical plexus) ascends posterior to ear, supplies skin behind auricle and upper neck. It emerges at Erb’s point with other cutaneous cervical branches.
Contents of the Quadrangular Space Diagram
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Contents of the Quadrangular Space Diagram

Quadrangular space contents include axillary nerve and posterior circumflex humeral artery/vein, bounded by teres minor superiorly, teres major inferiorly, long head triceps medially, humerus laterally. Compression causes deltoid/teres minor weakness.
ECG Tracing with Heart ContractionN
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ECG Tracing with Heart ContractionN

ECG tracing with heart contraction synchronizes electrical and mechanical events, where the P wave reflects atrial depolarization initiating contraction to fill ventricles, followed by the flat PR interval during AV…
Borders of the Femoral Canal Diagram
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Borders of the Femoral Canal Diagram

Femoral canal boundaries: anterior inguinal ligament, posterior pectineal ligament, medial lacunar ligament, lateral femoral vein. It’s the medial compartment of femoral sheath, site of femoral hernias (often Richter’s type).
Large Medium Vein Venule
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Large Medium Vein Venule

Veins progress from venules collecting capillary blood, merging into small then medium veins with increasing smooth muscle and valves preventing backflow in limbs against gravity, finally large veins like venae…
Borders of the Cavernous Sinus Diagram
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Borders of the Cavernous Sinus Diagram

The Borders of the Cavernous Sinus diagram gives a clean cross-section view of this important dural venous space next to the pituitary. The walls are clearly marked—superior, inferior, medial, lateral—while…
Overview of the Peritoneal Abdominal Cavity Diagram
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Overview of the Peritoneal Abdominal Cavity Diagram

The peritoneal abdominal cavity includes parietal peritoneum lining walls, visceral covering organs, and mesenteries/omenta suspending structures. Greater/lesser sacs, transverse mesocolon, and root of mesentery divide spaces for fluid movement.
Course of the Superior Epigastric Artery Diagram
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Course of the Superior Epigastric Artery Diagram

The superior epigastric artery (from internal thoracic) descends in rectus sheath, anastomoses with inferior epigastric, supplying rectus abdominis and anterior abdominal wall. It forms part of Hesselbach’s triangle boundary.
Layers of the Thoracolumbar Fascia Diagram
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Layers of the Thoracolumbar Fascia Diagram

Thoracolumbar fascia layers: anterior (psoas/quadratus lumborum), middle (between erector spinae/quadratus), posterior (covering erector spinae). They enclose paraspinal muscles, provide attachment for obliques/transversus.
Cutaneous Innervation to the Upper Limb Diagram
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Cutaneous Innervation to the Upper Limb Diagram

Cutaneous innervation of the upper limb includes dermatomes from C5-T1: axillary (regimental badge), musculocutaneous (lateral forearm), median (palm/thumb-index-middle), ulnar (little/ring), radial (dorsal hand). Overlap helps in nerve lesion mapping.
CT Scan Head Scanning Diagram
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CT Scan Head Scanning Diagram

CT head scanning uses X-rays in axial slices, bone windows for skull fractures, soft tissue windows for hemorrhage/infarct/edema. Contrast enhances vessels/tumors; it’s fast for trauma/stroke evaluation.
Medial and Lateral Pectoral Nerve Diagram
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Medial and Lateral Pectoral Nerve Diagram

Medial pectoral nerve (C8-T1) pierces pectoralis minor to supply it and pectoralis major sternocostal head; lateral pectoral nerve (C5-C7) supplies clavicular head of pectoralis major. Both from brachial plexus.
Borders of the Triangular Interval Diagram
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Borders of the Triangular Interval Diagram

The Borders of the Triangular Interval diagram outlines this posterior arm space bounded by teres major superiorly, long head of triceps medially, shaft of humerus laterally, with radial nerve and…
Positive Trendlenburg Test Diagram
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Positive Trendlenburg Test Diagram

Positive Trendelenburg test: pelvis drops on unsupported side during single-leg stance due to weak gluteus medius/minimus (contralateral hip drop). Indicates superior gluteal nerve lesion, hip abductor weakness, or hip joint…
Net Filtration PressureN
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Net Filtration PressureN

Net filtration pressure in glomerulus drives plasma ultrafiltrate formation, calculated as glomerular hydrostatic pressure minus capsular hydrostatic and oncotic pressures, typically around 10 mmHg favoring outflow, regulated by afferent and…
Anatomical Course of the Subclavian Artery Diagram
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Anatomical Course of the Subclavian Artery Diagram

Subclavian artery course: right from brachiocephalic, left from aortic arch, three parts by scalenus anterior (pre-, post-, inter-). Branches: vertebral, internal thoracic, thyrocervical trunk, costocervical, dorsal scapular.