| Bone: Superior pubic ramus | |
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| Right hip bone. External surface. (Superior ramus of pubis labeled at center right. ) | |
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| Pelvis. Superior ramus is 4b. | |
| Latin | ramus superior ossis pubis |
| Gray's | subject #57 236 |
| Dorlands / Elsevier |
r_02/12692205 |
The superior pubic ramus extends from the body to the median plane where it articulates with its fellow of the opposite side. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. Introduction ( classes Long bones body or Diaphysis Medullary canal Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group It is conveniently described in two portions, viz. , a medial flattened part and a narrow lateral prismoid portion.
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Medial portion
The Medial Portion of the superior ramus, formerly described as the body of the pubis, is somewhat quadrilateral in shape, and presents for examination two surfaces and three borders.
Surfaces
The anterior surface is rough, directed downward and outward, and serves for the origin of various muscles. The Adductor longus arises from the upper and medial angle, immediately below the crest; lower down, the Obturator externus, the Adductor brevis, and the upper part of the Gracilis take origin. The adductor longus muscle is a Muscle of the Human body. It is a part of the adductor group of the thigh that as the name suggests adducts the thigh The obturator externus muscle is a flat triangular muscle which covers the outer surface of the anterior wall of the Pelvis. The adductor brevis is a muscle in the thigh situated immediately behind the Pectineus and Adductor longus. The Gracilis ( Latin slender is the most superficial muscle on the Medial side of the Thigh.
The posterior surface, convex from above downward, concave from side to side, is smooth, and forms part of the anterior wall of the pelvis. It gives origin to the Levator ani and Obturator internus, and attachment to the puboprostatic ligaments and to a few muscular fibers prolonged from the bladder. The Levator ani is a broad thin Muscle, situated on the side of the Pelvis. The obturator internus muscle originates on the medial surface of the Obturator membrane, the Ischium near the membrane and the rim of the pubis.
Borders
The upper border presents a prominent tubercle, the pubic tubercle (pubic spine), which projects forward; the inferior crus of the subcutaneous inguinal ring (external abdominal ring), and the inguinal ligament (Poupart’s ligament) are attached to it. The pubic tubercle (also known as the pubic spine) is a prominent forward-projecting tubercle on the upper border of the medial portion of the Superior ramus The pubic tubercle (also known as the pubic spine) is a prominent forward-projecting tubercle on the upper border of the medial portion of the Superior ramus The Superficial inguinal ring is bounded below by the crest of the pubis; on either side by the margins of the opening in the Aponeurosis, which are called the In the aponeurosis of the External oblique, immediately above the crest of the pubis, is a triangular opening the subcutaneous inguinal ring ( superficial inguinal The inguinal (Poupart's ligament is a band running from the Pubic tubercle to the Anterior superior iliac spine.
Passing upward and laterally from the pubic tubercle is a well-defined ridge, forming a part of the pectineal line which marks the brim of the lesser pelvis: to it are attached a portion of the inguinal falx (conjoined tendon of Obliquus internus and Transversus), the lacunar ligament (Gimbernat’s ligament), and the reflected inguinal ligament (triangular fascia). The lesser pelvis (or true pelvis) is that part of the Pelvic cavity which is situated below and behind the Pelvic brim. Passing upward and lateralward from the Pubic tubercle is a well-defined ridge forming a part of the Pectineal line which marks the Brim of the Lesser pelvis The lacunar Ligament ( Gimbernat ’s ligament) is that part of the Aponeurosis of the External oblique muscle which is reflected backward and The reflected inguinal ligament ( triangular fascia) is a layer of tendinous fibers of a triangular shape formed by an expansion from the Lacunar ligament and the
Medial to the pubic tubercle is the crest, which extends from this process to the medial end of the bone. It affords attachment to the inguinal falx, and to the Rectus abdominis and Pyramidalis. Passing upward and lateralward from the Pubic tubercle is a well-defined ridge forming a part of the Pectineal line which marks the Brim of the Lesser pelvis The rectus abdominis muscle (commonly known as "abs" is a paired Muscle running vertically on each side of the anterior wall of the human abdomen (and in some other The pyramidalis is a small and triangular muscle anterior to the Rectus abdominis, and contained in the Rectus sheath.
The point of junction of the crest with the medial border of the bone is called the angle; to it, as well as to the symphysis, the superior crus of the subcutaneous inguinal ring is attached. A symphysis is a fibrocartilaginous fusion between two bones It is a type of Cartilaginous joint. The Superficial inguinal ring is bounded below by the crest of the pubis; on either side by the margins of the opening in the Aponeurosis, which are called the
The medial border is articular; it is oval, and is marked by eight or nine transverse ridges, or a series of nipple-like processes arranged in rows, separated by grooves; they serve for the attachment of a thin layer of cartilage, which intervenes between it and the interpubic fibrocartilaginous lamina.
The lateral border presents a sharp margin, the obturator crest, which forms part of the circumference of the obturator foramen and affords attachment to the obturator membrane. The obturator foramen is the hole created by the Ischium and pubis bones of the Pelvis through which nerves and muscles pass The obturator membrane is a thin fibrous sheet which almost completely closes the Obturator foramen.
Lateral portion
The Lateral Portion of the ascending ramus has three surfaces: superior, inferior, and posterior.
Surfaces
- The superior surface presents a continuation of the pectineal line, already mentioned as commencing at the pubic tubercle. The pubic tubercle (also known as the pubic spine) is a prominent forward-projecting tubercle on the upper border of the medial portion of the Superior ramus In front of this line, the surface of bone is triangular in form, wider laterally than medially, and is covered by the Pectineus. The pectineus muscle is a flat quadrangular Muscle, situated at the anterior part of the upper and medial aspect of the Thigh. The surface is bounded, laterally, by a rough eminence, the iliopectineal eminence, which serves to indicate the point of junction of the ilium and pubis, and below by a prominent ridge which extends from the acetabular notch to the pubic tubercle. Medial to the Anterior inferior iliac spine is a broad shallow groove over which the Iliacus and Psoas major pass The ilium of the Pelvis is divisible into two parts the body and the ala the separation is indicated on the top surface by a curved line the arcuate line and on the For the bone in many mammals often called the penis bone see Baculum The android pubic bone is the Ventral and Anterior The Acetabulum presents below a deep notch the acetabular notch, which is continuous with a circular non-articular depression the Acetabular fossa, at the bottom
- The inferior surface forms the upper boundary of the obturator foramen, and presents, laterally, a broad and deep, oblique groove, for the passage of the obturator vessels and nerve; and medially, a sharp margin, the obturator crest, forming part of the circumference of the obturator foramen, and giving attachment to the obturator membrane. The obturator foramen is the hole created by the Ischium and pubis bones of the Pelvis through which nerves and muscles pass The anterior border of Superior pubic ramus presents a sharp margin the obturator crest, which forms part of the circumference of the Obturator foramen superiorly The obturator membrane is a thin fibrous sheet which almost completely closes the Obturator foramen.
- The posterior surface constitutes part of the anterior boundary of the lesser pelvis. The lesser pelvis (or true pelvis) is that part of the Pelvic cavity which is situated below and behind the Pelvic brim. It is smooth, convex from above downward, and affords origin to some fibers of the Obturator internus. The obturator internus muscle originates on the medial surface of the Obturator membrane, the Ischium near the membrane and the rim of the pubis.
See also
External links
- SUNY Labs 44:st-0720 - "The Male Pelvis: Hip bone"
- superior+pubic+ramus at eMedicine Dictionary
- Atlas of anatomy at UMich back_bone21 - "Sacrum, Median Sagittal Section"
- Norman/Georgetown pelvis (pelvislateral)
This article was originally based on an entry from a public domain edition of Gray's Anatomy. For the bone in many mammals often called the penis bone see Baculum The android pubic bone is the Ventral and Anterior The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely two medical doctors The University of Michigan Ann Arbor ( U of M, U-M, UM or simply Michigan) is a top-ranked Coeducational public research Georgetown University is a Jesuit Private university located in Georgetown Washington D The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened is an English-language Human anatomy Textbook As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
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