Bridgman Question
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  1. #1
    Riiroi's Avatar
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    Bridgman Question

    Hey guys

    Im having trouble understanding what Bridgman is trying to say in this paragraph from his Guide to Drawing from Life book.
    Can anybody tell me how the sterno-cleido-mastoid depresses the face when the head is turned?

    Thanks

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    My English isn't that good, but a muscle can only get shorter, that's what it does. Try to tense this muscle, you'll feel your head go down a little (vertically, as if your neck gets shorter)

    Edited: I looked it up this time in another anatomybook which says: "contraction of both muscles flexes the cervical part of the vertebral column and draws the head forward". I tried it out and it sure does.
    Also, I didn't read your question properly the first time, so it's what Briggsy says: the text is indeed a bit misleading because the punctuation isn't right.

    Last edited by NightVision; October 2nd, 2008 at 05:30 PM.
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    hes saying that anatomy is depressing

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    It's the other way around, Kev. When the left SCM contracts, it turns the head to the right.

    It looks to me like the semicolon in the text is misplaced. It should read:

    "The sterno-cleido-mastoid turns the head from side to side towards the shoulder; when both muscles act together, they depress the face downwards".

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    Change "depress" to "pull" and you have what kev said. 8)

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    I think you didn't get my point, hipster. You might like to re-read my first line more carefully.

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  10. #7
    kev ferrara is offline Registered User Level 17 Gladiator: Spartacus' Dimachaeri
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    Good catch, Briggsy, I did state that backwards.

    A tensed sterno-mastoid pulls the side/back of the head around to face the front of the body. So a tensed right sterno mastoid pulls the right side of the head toward the front, turning the nose toward the left. When the left sterno mastoid pull the left side of the head toward the front of the body, the nose turns right.

    And when both are tensed they pull the head forward and down.

    The dynamic tension of the opposite muscles in the nape of the neck and the upper back keep the Sternomastoid from simply lowering the head whenever it tenses.

    Last edited by kev ferrara; October 2nd, 2008 at 11:35 AM.
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  12. #8
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    Thanks for the replies guys.

    Im still a little confused. When the left or right SCM is tensed, does it mean that it stretches and is taut like a rubber band?

    What is the state of the SCM when the head is raised up. I've read through Bridgman's book and it shows an image of both the left and right SCM stretched and they both look taut. Does this mean that when both SCM are tensed, they lift the head up as well?

    Also, in this context, does contract and tensed mean the same thing?

    I apologize for my inability to understand this.

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  13. #9
    kev ferrara is offline Registered User Level 17 Gladiator: Spartacus' Dimachaeri
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    When a muscle "tenses" it contracts. So it gets shorter, but bulkier. So when a Sterno Mastoid tenses, it gets shorter and pulls the side/back of the head forward, turning the head.

    At least Icarus tried!


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  14. #10
    Riiroi's Avatar
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    Thanks for the replies guys!

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