Postacchini and Massobrio Classification (Nathan Modification) Can be classified into 6 types: Type I (slight curve): Curved slightly forward with apex pointing caudally (>50% incidence) Type II (forward curve): More prominent ventral curvature with coccyx apex pointing anteriorly (8-32% incidence) Type III (sharp angle): Acute anterior angulation of coccyx but…
Tag: Anatomy
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Kambin’s Triangle or Prism
There is confusion regarding the borders of Kambin’s triangle across the literature. Kambin originally described the borders of this triangular working zone as: Though it was named as a “triangle” it was described with 4 borders with 2 triangles (in AP view and Lateral view) which gives a 3D structure…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Lateral and Medial Pectoral Nerve : Mnemonic
Mnemonics a. Lateral is Less and Medial is More. b. Major receives 2 innervations and Minor receives 1 innervation. Hence, Lateral pectoral nerve passes through and supplies Pectoralis major. Medial pectoral nerve passes through and supplies Pectoralis major and minor. The lateral pectoral nerve and the medial pectoral nerve form…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Anatomy of Physis (Growth Plate)
Periphery of physis: The physis is connected to the epiphysis and metaphysis peripherally via: Blood supply of physis: There are three sources of blood supply to the physis: the epiphyseal, metaphyseal, and perichondral circulations. Zones of physis: Zones Characteristics Functions Blood supply Diseases Epiphysis Epiphyseal artery Multiple Epiphyseal Dysplasia (MED) Physis 1….
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Zero Position of Saha
Zero Position Zero position is the position during elevation in coronal or sagittal plane or in any plane where: Zero position of shoulder The humerus is elevated to about 165° with individual variations and is in the newly acquired scapular plane (around 45° anterior to the coronal plane). The humeral…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Triangles of Neck
Triangles Subdivisions Boundaries Floor Contents Clinical relevance Anterior Digastric (submandibular) – further subdivided into 3 small triangles:a. Lesser’sb. Pirogov’sc. Beclard’s 2 digastric belliesMandible Mylohyoid Submandibular glandSubmandibular nodesFacial nerve – Marginal mandibular branch (MMB)Facial vesselsLingual vesselsHypoglossal nerveNerve to mylohyoid Incision 2 finger breadth below inferior border of mandible avoids MMB of…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Unpaired Branches of Abdominal Aorta : Mnemonic
Celiac trunk Superior mesenteric artery (SMA) Inferior mesenteric artery (IMA) Level T12 L1 L3 Branches LHS (Left Hand Side) MRI (distal to proximal) LeSS 1. Left gastric artery Middle colic artery Left colic artery 2. common Hepatic artery Right colic artery Sigmoid arteries 3. Splenic artery Ileocolic artery Superior rectal…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Pelvic Lymphatic Drainage
1. Para-aortic (lumbar) nodes: Gonads (derive blood supply from kidneys) 2. Inferior mesenteric nodes: As of blood supply – to the structures derived from hindgut 3. Common iliac nodes: Receives external and internal iliac nodes; Drains into para-aortic nodes 4. Superficial inguinal nodes: Everything that can be touched with fingers…