Activity 9.1 Examining the Structure of Fibrous Joints The bones that form a fib

Question

Activity 9.1 Examining the Structure of Fibrous Joints The bones that form a fibrous polnt are held firmly together by fibooent connective tissue in which collagen fibers predominate. A j oint cavity is not present, and little or no types of fibrous joints in the human body are sutures, sy (singular gomphosis). syndesmoses (singular syndesmosis), and gomphoses Sutures are very tight articulations between adjacent bone This type of joint is only found in the skul In the adult, the connective tissue fibers that connect the bones become completely ossified. Thus, the bones are fused together and no movement occurs between them. 1 On the adult skull, dentify the major sutures between cranial bones. The lambdoid suture is the The sagittal suture is the joint on the superior surface of the posteriorly, and the two skull, between the two parietal The coronal suture is the The s of the skull ion each side behween the frontal anteriorly, and the two joint between the occipital parietal bones, anteriorly between the parietal bones, posteriory temporal bone, inferior parietal bone, superiorly, and the bones etal bone bone Occipit bone In the fetus and infant, ossification is not complete, and the articulating bones at the sutures are held together by areas of connective tissue fibers. The largest regions of connective tissue are called fontanelles, or "soft spots. "Because the sutures are not fully developed, there is some movement between the bones. Identify the major fontanelles in the fetal skull: The anterior (frontal) fontanelle is located at the junction of the The posterior (occipital fontanelle is located at the junction of the The two anterolateral (sphenoidal) fontanelles are each located at the junction of The two posterolateral (mastoid) fontanelles are each located at the junction of the and sutures. the and and 130 EXERCISE 9 Articulations

Explanation / Answer

ANSWERS :

1) The anterior (frontal) fontenalle is located at the junction of coronal and sagittal sutures.

2) The posterior (occipital) fontenalle is located at the junction of the sagittal and labdoidal sutures.

3) The anterolateral (sphenoidal) fontenalles are located at the junction of squamous and coronal sutures.

4) Posterolateral (mastoid) fontenalles are located at the junction of squamous and lambdoidal sutures.

5) All the symphysis joints as pubic symphysis (joint between two pubic bones) are made of hyaline and fibro cartilage.

6) The epiphyseal plates are formed at the end of some long spongy bones and a special cartilage (hyaline cartilage) that make the articulation between two bones.

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