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
Polycystic ovary syndrome on ultrasound typically shows enlarged ovaries with multiple small follicles arranged around the periphery, often described as a string of pearls. These follicles represent arrested development due to hormonal imbalance, particularly elevated androgens and disrupted ovulatory cycles. View Diagram Ultrasound Polycystic Ovary Syndrome
Synovial joints are highly mobile joints characterized by a synovial cavity filled with lubricating fluid, articular cartilage covering the joint surfaces, and a fibrous capsule that encloses the space. They come in several types, including hinge joints that permit flexion View Diagram Types of Synovial Joint
The posterior blood supply of the heart is primarily provided by the posterior descending artery and the branches of the circumflex and right coronary arteries, depending on coronary dominance. These vessels deliver oxygenated blood to the diaphragmatic surfaces of the View Diagram Blood Supply to the Heart Posterior
The musculocutaneous nerve arises from the lateral cord of the brachial plexus and contains fibers from spinal roots C5 to C7. It enters the arm by piercing the coracobrachialis muscle, which serves as an important anatomical landmark, and then travels View Diagram Anatomical Course of the Musculocutaneous Nerve
The pretracheal fascia is a layer of deep cervical fascia that extends from the hyoid bone into the thorax, enclosing the thyroid gland, trachea, and esophagus. It forms a distinct compartment in the anterior neck, separating these structures from the View Diagram Diagram of the Pretracheal Fascia Layer of the Neck Labelled
The trachea divides into the right and left primary bronchi at the level of the sternal angle, forming the main airway passage into the lungs. The tracheal wall is reinforced by C-shaped cartilage rings that keep the airway open, while View Diagram The Trachea and Bronchial Divisions
The parietal pleura consists of four continuous regionscostal, diaphragmatic, mediastinal, and cervical pleuraeach lining a different part of the thoracic cavity. The costal pleura covers the inner surfaces of the ribs and intercostal spaces, while the diaphragmatic pleura reflects over View Diagram Parts of the Parietal Pleura
The common hepatic artery gives rise to several branches, creating a complex vascular network that supplies the liver, stomach, duodenum, and pancreas. After branching from the coeliac trunk, it typically divides into the proper hepatic artery and the gastroduodenal artery. View Diagram Schematic Common Hepatic Artery Branches
The internal structure of the kidney is organized into an outer cortex and an inner medulla, which together contain millions of nephrons that filter blood and produce urine. The cortex houses the glomeruli and convoluted tubules responsible for the initial View Diagram Internal Structure of the Kidney
Blood Flow Contracted Ventricles: During ventricular systole, the ventricles contract, pushing blood into the pulmonary artery from the right ventricle and the aorta from the left ventricle.
Thoracic Upper Limb Veins: The thoracic and upper limb veins include the subclavian, axillary, brachial, cephalic, and basilic veins, which return blood from the arms and upper chest to the heart via the superior vena cava.
Hemoglobin: Hemoglobin is a protein in red blood cells that binds oxygen in the lungs and releases it in tissues, playing a vital role in respiration and giving blood its red color.
Development of Lower Respiratory System: The lower respiratory tract develops from the embryonic foregut, beginning with the formation of the laryngotracheal diverticulum, which branches into the bronchi, bronchioles, and eventually the alveoli.
The Peritoneum: The peritoneum is a double-layered serous membrane lining the abdominal cavity, consisting of the parietal layer (lining the cavity) and visceral layer (covering organs), which supports and reduces friction between organs.
