Fetal Skull


Fetal skull is to some extent compressible, and made mainly of thin pliable tabular (flat) bones forming the vault. This is anchored to the rigid and incompressible bones at the base of the skull.
Areas of skull: the skull is arbitrarily divided into several zones of obstetrical importance.
These are
Vertex: It is a quadrangular area bounded  interiorly by the bregma and coronal sutures behind by the lambda and labdoid sutures and laterally by lines passing through the parietal eminences.
Brow: It is an area bounded on one side by the anterior fontanelle and  on the other side by the root of the nose and supra-orbital ridges of either side.
Face: it is an area bounded on one side by root of the nose and supra-orbital ridges and on the other, by the junction of the floor of the mouth with neck.

Sinciput is the area lying in front of the anterior fontanelle and corresponds to the area of brow and the occiput is limited to the occipital bone.
Flat bones of the vault are united together by non-ossified membranes attached to the margins of the bones these are  called sutures and fontanelles.
1.       Sagittal or longitudinal suture: Lies between two parietal bones bones
2.       Coronal sutures: Run between parietal and frontal bones  on either side
3.       Frontal sutures: lies between two frontal bones.
4.       Lamboid sutures: separate the occipital bone and the two parietal bones.

l. Permits gliding movement during moulding.
2. Digital palpation of sagittal suture during internal examinsation during labour.
Fontanelles: Wide gap in the Suture is called fontanelle.
Anterior fontanelle: It is formed by the joining of the four sutures in the midplane. The shape is like a diamond, antero-posterior and transverse diameters measure approximately 3 cm each. The floor is formed by a membrane and it becomes ossified 18 months after birth.
l . Its palpation thought internal examination denotes the degree of flexion of the head
2. Facilitate moulding of the head.
3. Palpation of the floor reflects intracranial status -Depressed in dehydration, elevated in raised intracranial tension.
Posterior fontanelle: It is formed by junction of three suture lines –Sagittal suture anteriorly  and lambdoid suture on either side. It is triangular in shape and measures about 1.2x1.2 cm .Its floor is membranous but becomes bony at term.

Transverse Diameters of the Fetal Skull:
Biparietal Diameter
9.5 cm
Between the 2 parietal eminences
Bitemporal Diameter

8 cm
It is the distance between the antero-inferior ends of the coronal suture.
Bimastoid Diameter
7.5 cm
Between the 2 mastoid processes (Not reducible nor destroyable even by destructive procedures)
It extends from a point placed below one parietal eminence to a point placed above the other parietal eminence of the opposite side
            .           .
Diameters of skull:
Nape of neck to centre of bregma
9.5 cm
Complete flexion
Nape of neck to 2.5-cm. In front of bregma
10 cm
Incomplete -flexion
Root of nose to occipital protuberance
11.5 cm
Marked deflexion
Point of chin to above posterior fontanelle
14 cm
Partial extension
From below chin to centre of bregma
11.5 cm
Incomplete extension
From below chin to in front of post. fontanelle
9.5 cm
Complete extension
Moulding: It is the alteration of the shape of the forecoming head while passing through the resistant  during labour.
 During normal delivery, an alteration of 4mm in skull diameter commonly occurs.
Caput succedaneum:
It is the formation of swelling due to stagnation of fluid in the layers of scalp beneath the gridle of contact.

Diffuse scalp edema resulting from venous congestion due to prolonged pressure on the fetal head by the pelvis bones.



anaphysio,3,ASEPSIS AND INFECTION CONTROL,9,audio,1,biochemistry,2,blog,1,BSN Notes: Assessment in Psychiatry,6,BSN Notes: Burns,11,BSN Notes: Care of Terminally Ill Patients,6,BSN Notes: Childhood and Developmental Disorders,6,BSN Notes: Common Behavioural and Social Problems,4,BSN Notes: Common Childhood Diseases,7,BSN Notes: Common Signs And Symptoms,32,BSN Notes: Community Mental Health Nursing,12,BSN Notes: Critical Care,12,BSN Notes: Disaster and Emergency,15,BSN Notes: ENT,8,BSN Notes: Eye,25,BSN Notes: History and Assessment,24,BSN Notes: Introduction of Psychiatry,27,BSN Notes: Legal Issues In Psychiatry,4,BSN Notes: Medication Administration,24,BSN Notes: Neuritic_Stress related and Somatization Disorders,10,BSN Notes: Neurology,6,BSN Notes: Oncological Nursing,8,BSN Notes: Organic Brain Disorders,1,BSN Notes: Oxygenation,3,BSN Notes: Personality_Sexual and Eating Disorders,5,BSN Notes: Principles and Concepts of Psychiatry Nursing,2,BSN Notes: Psych-pharmacology and Other Treatment Modalities,30,BSN Notes: Psychiatry Emergencies and Crisis Intervention,4,BSN Notes: Psychosocial Needs,5,BSN Notes: Schizophrenia and othe Psychotic Disorders,4,BSN Notes: The healthy child,5,BSN Notes: TNPR,9,BSN Notes: Urinary Elimination,14,chn,41,clinicalkannada,4,clinicals1,35,clinicals2,10,clinicals3,26,clinicals4,11,Code of Ethics,3,community,7,Critical thinking,7,drugs,3,Equipment & Linen,9,Equipments & Linen,1,Etics and Legal,1,exa,1,exam,11,featured,19,fon,141,fon3,141,fun,1,geriatric,1,graphic,1,Growth and Development,5,he,93,hotspot,6,kannada,54,language,1,Machinery,10,Medications,1,Memory Tools,9,mhn,126,microbiology,3,misc,2,mnemonics,48,msn,137,NCLEX,13,ncp,27,news,4,obg,28,OBG Medications,1,Peri- operative Nursing,2,pharma,29,Physical Examination and Assessment,9,Psychology,2,Pulse,7,resources,1,Respiration,4,Transitional care,1,Ventilators,5,voice,2,
notes.nursium.com: Fetal Skull
Fetal Skull
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy